doc: driver-model: Convert MIGRATION.txt to reST

Convert plain text documentation to reStructuredText format and add
it to Sphinx TOC tree. No essential content change.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/doc/driver-model/index.rst b/doc/driver-model/index.rst
index 96fbd72..663aa5d 100644
--- a/doc/driver-model/index.rst
+++ b/doc/driver-model/index.rst
@@ -7,3 +7,4 @@
    :maxdepth: 2
 
    design
+   migration
diff --git a/doc/driver-model/MIGRATION.txt b/doc/driver-model/migration.rst
similarity index 84%
rename from doc/driver-model/MIGRATION.txt
rename to doc/driver-model/migration.rst
index d38be35..a26e7ab 100644
--- a/doc/driver-model/MIGRATION.txt
+++ b/doc/driver-model/migration.rst
@@ -1,5 +1,7 @@
+.. SPDX-License-Identifier: GPL-2.0+
+
 Migration Schedule
-====================
+==================
 
 U-Boot has been migrating to a new driver model since its introduction in
 2014. This file describes the schedule for deprecation of pre-driver-model
@@ -8,8 +10,8 @@
 CONFIG_DM_MMC
 -------------
 
-Status: In progress
-Deadline: 2019.04
+* Status: In progress
+* Deadline: 2019.04
 
 The subsystem itself has been converted and maintainers should submit patches
 switching over to using CONFIG_DM_MMC and other base driver model options in
@@ -18,8 +20,8 @@
 CONFIG_DM_USB
 -------------
 
-Status: In progress
-Deadline: 2019.07
+* Status: In progress
+* Deadline: 2019.07
 
 The subsystem itself has been converted along with many of the host controller
 and maintainers should submit patches switching over to using CONFIG_DM_USB and
@@ -28,8 +30,8 @@
 CONFIG_SATA
 -----------
 
-Status: In progress
-Deadline: 2019.07
+* Status: In progress
+* Deadline: 2019.07
 
 The subsystem itself has been converted along with many of the host controller
 and maintainers should submit patches switching over to using CONFIG_AHCI and
@@ -38,8 +40,8 @@
 CONFIG_BLK
 ----------
 
-Status: In progress
-Deadline: 2019.07
+* Status: In progress
+* Deadline: 2019.07
 
 In concert with maintainers migrating their block device usage to the
 appropriate DM driver, CONFIG_BLK needs to be set as well.  The final deadline
@@ -48,14 +50,14 @@
 Kconfig around using CONFIG_PARTITIONS and CONFIG_HAVE_BLOCK_DEVICE and make
 use of CONFIG_BLK / CONFIG_SPL_BLK as needed.
 
-CONFIG_DM_SPI
-CONFIG_DM_SPI_FLASH
--------------------
+CONFIG_DM_SPI / CONFIG_DM_SPI_FLASH
+-----------------------------------
 
 Board Maintainers should submit the patches for enabling DM_SPI and DM_SPI_FLASH
 to move the migration with in the deadline.
 
-No dm conversion yet:
+No dm conversion yet::
+
 	drivers/spi/cf_spi.c
 	drivers/spi/fsl_espi.c
 	drivers/spi/lpc32xx_ssp.c
@@ -63,10 +65,11 @@
 	drivers/spi/sh_spi.c
 	drivers/spi/soft_spi_legacy.c
 
-	Status: In progress
-	Deadline: 2019.04
+* Status: In progress
+* Deadline: 2019.04
 
-Partially converted:
+Partially converted::
+
 	drivers/spi/davinci_spi.c
 	drivers/spi/fsl_dspi.c
 	drivers/spi/kirkwood_spi.c
@@ -74,13 +77,8 @@
 	drivers/spi/omap3_spi.c
 	drivers/spi/sh_qspi.c
 
-	Status: In progress
-	Deadline: 2019.07
-
---
-Jagan Teki <jagan@openedev.com>
-12/24/2018
-03/14/2018
+* Status: In progress
+* Deadline: 2019.07
 
 
 CONFIG_DM_PCI