TI: Drop 'CONFIG_OMAP'

In the two cases in the code where we use CONFIG_OMAP as a useful test
currently we can make use of CONFIG_ARCH_OMAP2PLUS instead.  With that
changed we can drop all defines of CONFIG_OMAP.  While in here,
CONFIG_OMAP3430 is only defined and then never used, so drop.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/include/asm/spl.h b/arch/arm/include/asm/spl.h
index a0bda28..5d7f7e6 100644
--- a/arch/arm/include/asm/spl.h
+++ b/arch/arm/include/asm/spl.h
@@ -7,7 +7,7 @@
 #ifndef	_ASM_SPL_H_
 #define	_ASM_SPL_H_
 
-#if defined(CONFIG_OMAP) \
+#if defined(CONFIG_ARCH_OMAP2PLUS) \
 	|| defined(CONFIG_EXYNOS4) || defined(CONFIG_EXYNOS5) \
 	|| defined(CONFIG_EXYNOS4210)
 /* Platform-specific defines */