Convert CONFIG_SDCARD et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SDCARD
   CONFIG_SPIFLASH

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/T1042D4RDB_SPIFLASH_defconfig b/configs/T1042D4RDB_SPIFLASH_defconfig
index f6c0a0d..9474e20 100644
--- a/configs/T1042D4RDB_SPIFLASH_defconfig
+++ b/configs/T1042D4RDB_SPIFLASH_defconfig
@@ -19,8 +19,8 @@
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="SPIFLASH"
 CONFIG_RAMBOOT_PBL=y
+CONFIG_SPIFLASH=y
 CONFIG_SYS_FSL_PBL_PBI="$(SRCTREE)/board/freescale/t104xrdb/t104x_pbi.cfg"
 CONFIG_SYS_FSL_PBL_RCW="$(SRCTREE)/board/freescale/t104xrdb/t1042d4_spi_rcw.cfg"
 CONFIG_BOOTDELAY=10