Convert CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR
   CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/imx28_xea_defconfig b/configs/imx28_xea_defconfig
index 37233ba..1537e83 100644
--- a/configs/imx28_xea_defconfig
+++ b/configs/imx28_xea_defconfig
@@ -48,6 +48,8 @@
 CONFIG_SYS_SPL_ARGS_ADDR=0x44000000
 CONFIG_SPL_FALCON_BOOT_MMCSD=y
 CONFIG_SYS_MMCSD_RAW_MODE_KERNEL_SECTOR=0x800
+CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR=0x400
+CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTORS=0x40
 CONFIG_SPL_SPI_LOAD=y
 CONFIG_SYS_SPI_U_BOOT_OFFS=0x10000
 CONFIG_SPL_YMODEM_SUPPORT=y