Txxx/RCW: Split unified RCW to RCWs for sd, spi and nand.

T series boards use unified RCW for sd, spi and nand boot.
Now split txxx_rcw.cfg to txxx_sd_rcw.cfg, txxx_spi_rcw.cfg
and txxx_nand_rcw.cfg for SPI/NAND/SD boot.
And modify RCW[PBI_SRC] for them:
	PBI_SRC=5            for SPI 24-bit addressing
	PBI_SRC=6            for SD boot
	PBI_SRC=14           for IFC NAND boot

Signed-off-by: Zhao Qiang <qiang.zhao@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>
diff --git a/include/configs/T4240RDB.h b/include/configs/T4240RDB.h
index a0580a8..77323a7 100644
--- a/include/configs/T4240RDB.h
+++ b/include/configs/T4240RDB.h
@@ -19,7 +19,6 @@
 
 #ifdef CONFIG_RAMBOOT_PBL
 #define CONFIG_SYS_FSL_PBL_PBI $(SRCTREE)/board/freescale/t4rdb/t4_pbi.cfg
-#define CONFIG_SYS_FSL_PBL_RCW $(SRCTREE)/board/freescale/t4rdb/t4_rcw.cfg
 #ifndef CONFIG_SDCARD
 #define CONFIG_RAMBOOT_TEXT_BASE        CONFIG_SYS_TEXT_BASE
 #define CONFIG_RESET_VECTOR_ADDRESS     0xfffffffc
@@ -45,6 +44,7 @@
 #define CONFIG_SYS_MPC85XX_NO_RESETVEC
 #endif
 #define CONFIG_SYS_LDSCRIPT	"arch/powerpc/cpu/mpc85xx/u-boot.lds"
+#define CONFIG_SYS_FSL_PBL_RCW $(SRCTREE)/board/freescale/t4rdb/t4_sd_rcw.cfg
 #define CONFIG_SPL_MMC_BOOT
 #endif