Convert CONFIG_SPL_COMMON_INIT_DDR to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_COMMON_INIT_DDR

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/freescale/p1010rdb/tlb.c b/board/freescale/p1010rdb/tlb.c
index 04faefe..7992666 100644
--- a/board/freescale/p1010rdb/tlb.c
+++ b/board/freescale/p1010rdb/tlb.c
@@ -72,8 +72,7 @@
 			MAS3_SX|MAS3_SW|MAS3_SR, MAS2_I|MAS2_G,
 			0, 7, BOOKE_PAGESZ_1M, 1),
 
-#if defined(CONFIG_SYS_RAMBOOT) || \
-	(defined(CONFIG_SPL) && !defined(CONFIG_SPL_COMMON_INIT_DDR))
+#if defined(CONFIG_SYS_RAMBOOT) || !CONFIG_IS_ENABLED(COMMON_INIT_DDR)
 	SET_TLB_ENTRY(1, CONFIG_SYS_DDR_SDRAM_BASE, CONFIG_SYS_DDR_SDRAM_BASE,
 			MAS3_SX|MAS3_SW|MAS3_SR, MAS2_M,
 			0, 8, BOOKE_PAGESZ_1G, 1),