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/common/spl/spl_mmc.c b/common/spl/spl_mmc.c
index 6116a68..f661474 100644
--- a/common/spl/spl_mmc.c
+++ b/common/spl/spl_mmc.c
@@ -229,7 +229,7 @@
 {
 	int ret;
 
-#if defined(CONFIG_SYS_MMCSD_RAW_MODE_ARGS_SECTOR)
+#if CONFIG_VAL(SYS_MMCSD_RAW_MODE_ARGS_SECTOR)
 	unsigned long count;
 
 	count = blk_dread(mmc_get_blk_desc(mmc),