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/common/spl/Kconfig b/common/spl/Kconfig
index af43b5f..6f56ca9 100644
--- a/common/spl/Kconfig
+++ b/common/spl/Kconfig
@@ -500,7 +500,7 @@
 		     ARCH_MX6 || ARCH_MX7 || \
 		     ARCH_ROCKCHIP || ARCH_MVEBU ||  ARCH_SOCFPGA || \
 		     ARCH_AT91 || ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
-		     OMAP44XX || OMAP54XX || AM33XX || AM43XX || \
+		     OMAP54XX || AM33XX || AM43XX || \
 		     TARGET_SIFIVE_UNLEASHED || TARGET_SIFIVE_UNMATCHED
 	select SPL_LOAD_BLOCK if SPL_MMC
 	select SPL_SYS_MMCSD_RAW_MODE if SPL_MMC
@@ -517,7 +517,7 @@
 	default 0x100 if ARCH_UNIPHIER
 	default 0x0 if ARCH_MVEBU
 	default 0x200 if ARCH_SOCFPGA || ARCH_AT91
-	default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || OMAP44XX || \
+	default 0x300 if ARCH_ZYNQ || ARCH_KEYSTONE || OMAP34XX || \
 		         OMAP54XX || AM33XX || AM43XX || ARCH_K3
 	default 0x4000 if ARCH_ROCKCHIP
 	default 0x822 if TARGET_SIFIVE_UNLEASHED || TARGET_SIFIVE_UNMATCHED