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/drivers/video/exynos_fb.c b/drivers/video/exynos_fb.c
index 8f3b826..69edc3a 100644
--- a/drivers/video/exynos_fb.c
+++ b/drivers/video/exynos_fb.c
@@ -28,7 +28,7 @@
 
 static unsigned int panel_width, panel_height;
 
-#ifdef CONFIG_OF_CONTROL
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 vidinfo_t panel_info  = {
 	/*
 	 * Insert a value here so that we don't end up in the BSS
@@ -126,7 +126,7 @@
 
 	exynos_backlight_on(1);
 
-#ifdef CONFIG_OF_CONTROL
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 	node = fdtdec_next_compatible(gd->fdt_blob, 0,
 						COMPAT_SAMSUNG_EXYNOS_FIMD);
 	if (node <= 0) {
@@ -150,7 +150,7 @@
 		exynos_mipi_dsi_init();
 }
 
-#ifdef CONFIG_OF_CONTROL
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 int exynos_lcd_early_init(const void *blob)
 {
 	unsigned int node;
@@ -295,7 +295,7 @@
 	set_system_display_ctrl();
 	set_lcd_clk();
 
-#ifdef CONFIG_OF_CONTROL
+#if CONFIG_IS_ENABLED(OF_CONTROL)
 #ifdef CONFIG_EXYNOS_MIPI_DSIM
 	exynos_init_dsim_platform_data(&panel_info);
 #endif