Convert CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
Signed-off-by: NTom Rini <trini@konsulko.com>

configs/ls1021aiot_sdcard_defconfig

@@ -20,6 +20,7 @@ CONFIG_ID_EEPROM=y
 CONFIG_SPL_FSL_PBL=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0xe8
+CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT=y
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_GREPENV=y
 CONFIG_SYS_I2C_EEPROM_ADDR_LEN=2

configs/ls1046aqds_nand_defconfig

@@ -32,6 +32,7 @@ CONFIG_SPL_FSL_PBL=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR=y
 CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_SECTOR=0x110
+CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT=y
 CONFIG_CMD_BOOTZ=y
 CONFIG_CMD_IMLS=y
 CONFIG_CMD_GREPENV=y

include/configs/ls1021aiot.h

@@ -63,7 +63,6 @@
 #define CONFIG_SPL_LIBCOMMON_SUPPORT
 #define CONFIG_SPL_LIBGENERIC_SUPPORT
 #define CONFIG_SPL_ENV_SUPPORT
-#define CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
 #define CONFIG_SPL_I2C
 #define CONFIG_SPL_WATCHDOG
 #define CONFIG_SPL_MMC_SUPPORT

include/configs/ls1046a_common.h

@@ -107,7 +107,6 @@
 #define CONFIG_SPL_ENV_SUPPORT
 #define CONFIG_SPL_WATCHDOG
 #define CONFIG_SPL_I2C
-#define CONFIG_SPL_MPC8XXX_INIT_DDR_SUPPORT
 
 #define CONFIG_SPL_NAND_SUPPORT
 #define CONFIG_SPL_DRIVERS_MISC