Convert CONFIG_EMMC_BOOT et al to Kconfig

This converts the following to Kconfig:
   CONFIG_EMMC_BOOT
   CONFIG_MAC_ADDR_IN_SPIFLASH
   CONFIG_NAND_BOOT
   CONFIG_SPL_FSL_PBL
   CONFIG_SYS_FSL_DDR4

In this case we re-sync options that had been set in
CONFIG_SYS_EXTRA_OPTIONS but should not have been as they have proper
entries.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/ls1021atsn_sdcard_defconfig b/configs/ls1021atsn_sdcard_defconfig
index 7bc1963..adb4a03 100644
--- a/configs/ls1021atsn_sdcard_defconfig
+++ b/configs/ls1021atsn_sdcard_defconfig
@@ -22,7 +22,6 @@
 CONFIG_FIT=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
-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"
@@ -32,6 +31,7 @@
 CONFIG_SILENT_CONSOLE=y
 CONFIG_MISC_INIT_R=y
 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_ENV_SUPPORT=y