omap4: duovero: Add Gumstix DuoVero machine.

This adds the Gumstix DuoVero machine [1].  This is a OMAP4430-based
computer-on-module (COM aka SOM) that can be mounted on various
expansion boards with different peripherals.

[1] https://store.gumstix.com/index.php/category/43/

Signed-off-by: Ash Charles <ash@gumstix.com>
[trini: Rename gpmc_enable_gpmc_cs_config to gpmc_enable_gpmc_net_config]
Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/boards.cfg b/boards.cfg
index d31bdba..546e1d2 100644
--- a/boards.cfg
+++ b/boards.cfg
@@ -362,6 +362,7 @@
 Active  arm         armv7          omap3       ti              evm                 omap3_evm_quick_nand                  -                                                                                                                                 -
 Active  arm         armv7          omap3       ti              sdp3430             omap3_sdp3430                         -                                                                                                                                 Nishanth Menon <nm@ti.com>
 Active  arm         armv7          omap3       timll           devkit8000          devkit8000                            -                                                                                                                                 Thomas Weber <weber@corscience.de>
+Active  arm         armv7          omap4       gumstix         duovero             duovero                               -                                                                                                                                 Ash Charles <ash@gumstix.com>
 Active  arm         armv7          omap4       ti              panda               omap4_panda                           -                                                                                                                                 Sricharan R <r.sricharan@ti.com>
 Active  arm         armv7          omap4       ti              sdp4430             omap4_sdp4430                         -                                                                                                                                 Sricharan R <r.sricharan@ti.com>
 Active  arm         armv7          omap5       ti              dra7xx              dra7xx_evm                            dra7xx_evm:CONS_INDEX=1                                                                                                           Lokesh Vutla <lokeshvutla@ti.com>