arm: ti: Remove omap4 platform support

There are no longer any OMAP4 platforms in U-Boot, remove the related
functionality.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/mach-omap2/Makefile b/arch/arm/mach-omap2/Makefile
index 8c10c69..d683c64 100644
--- a/arch/arm/mach-omap2/Makefile
+++ b/arch/arm/mach-omap2/Makefile
@@ -5,7 +5,6 @@
 
 obj-$(if $(filter am33xx,$(SOC)),y) += am33xx/
 obj-$(CONFIG_OMAP34XX) += omap3/
-obj-$(CONFIG_OMAP44XX) += omap4/
 obj-$(CONFIG_OMAP54XX) += omap5/
 
 obj-y	+= reset.o
@@ -19,7 +18,7 @@
 obj-y	+= utils.o
 
 obj-y	+= sysinfo-common.o
-ifneq ($(CONFIG_OMAP44XX)$(CONFIG_OMAP54XX),)
+ifdef CONFIG_OMAP54XX
 obj-y	+= hwinit-common.o
 obj-y	+= clocks-common.o
 obj-y	+= emif-common.o