Convert CONFIG_SD_BOOT et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SD_BOOT
   CONFIG_SD_BOOT_QSPI

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1021atsn_sdcard_defconfig b/configs/ls1021atsn_sdcard_defconfig
index 506a337..39cd8f4 100644
--- a/configs/ls1021atsn_sdcard_defconfig
+++ b/configs/ls1021atsn_sdcard_defconfig
@@ -22,11 +22,12 @@
 CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-CONFIG_SYS_EXTRA_OPTIONS="SPL_FSL_PBL,SD_BOOT,SD_BOOT_QSPI"
+CONFIG_SYS_EXTRA_OPTIONS="SPL_FSL_PBL"
 CONFIG_RAMBOOT_PBL=y
 CONFIG_SYS_FSL_PBL_PBI="board/freescale/ls1021atsn/ls102xa_pbi.cfg"
 CONFIG_SYS_FSL_PBL_RCW="board/freescale/ls1021atsn/ls102xa_rcw_sd.cfg"
 CONFIG_SD_BOOT=y
+CONFIG_SD_BOOT_QSPI=y
 CONFIG_BOOTDELAY=3
 CONFIG_SILENT_CONSOLE=y
 CONFIG_MISC_INIT_R=y