of: clean up OF_CONTROL ifdef conditionals

We have flipped CONFIG_SPL_DISABLE_OF_CONTROL.  We have cleansing
devices, $(SPL_) and CONFIG_IS_ENABLED(), so we are ready to clear
away the ugly logic in include/fdtdec.h:

 #ifdef CONFIG_OF_CONTROL
 # if defined(CONFIG_SPL_BUILD) && !defined(SPL_OF_CONTROL)
 #  define OF_CONTROL 0
 # else
 #  define OF_CONTROL 1
 # endif
 #else
 # define OF_CONTROL 0
 #endif

Now CONFIG_IS_ENABLED(OF_CONTROL) is the substitute.  It refers to
CONFIG_OF_CONTROL for U-boot proper and CONFIG_SPL_OF_CONTROL for
SPL.

Also, we no longer have to cancel CONFIG_OF_CONTROL in
include/config_uncmd_spl.h and scripts/Makefile.spl.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
Acked-by: Linus Walleij <linus.walleij@linaro.org>
diff --git a/include/configs/microblaze-generic.h b/include/configs/microblaze-generic.h
index 626fa44..8ce1c49 100644
--- a/include/configs/microblaze-generic.h
+++ b/include/configs/microblaze-generic.h
@@ -106,7 +106,8 @@
 # define CONFIG_XILINX_TB_WATCHDOG
 #endif
 
-#ifndef CONFIG_OF_CONTROL
+#if !defined(CONFIG_OF_CONTROL) || \
+	(defined(CONFIG_SPL_BUILD) && !defined(CONFIG_SPL_OF_CONTROL))
 /* ddr sdram - main memory */
 # define CONFIG_SYS_SDRAM_BASE	XILINX_RAM_START
 # define CONFIG_SYS_SDRAM_SIZE	XILINX_RAM_SIZE
diff --git a/include/configs/socfpga_common.h b/include/configs/socfpga_common.h
index 5ca45a9..c64c7ed 100644
--- a/include/configs/socfpga_common.h
+++ b/include/configs/socfpga_common.h
@@ -214,7 +214,7 @@
 #define CONFIG_SPI_FLASH_BAR
 #endif
 
-#ifdef CONFIG_OF_CONTROL	/* DW SPI is controlled via DT */
+#if CONFIG_IS_ENABLED(OF_CONTROL)	/* DW SPI is controlled via DT */
 #define CONFIG_DESIGNWARE_SPI
 #define CONFIG_CMD_SPI
 #endif