Convert CONFIG_USE_BOOTCOMMAND et al to Kconfig

This converts the following to Kconfig:
   CONFIG_USE_BOOTCOMMAND
   CONFIG_BOOTCOMMAND
   CONFIG_RAMBOOTCOMMAND
   CONFIG_NFSBOOTCOMMAND

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/display5_defconfig b/configs/display5_defconfig
index e68fae7..145b28e 100644
--- a/configs/display5_defconfig
+++ b/configs/display5_defconfig
@@ -33,6 +33,8 @@
 # CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_SUPPORT_RAW_INITRD=y
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_USE_BOOTCOMMAND=y
+CONFIG_BOOTCOMMAND="if run check_em_pad; then run recovery;else if test ${BOOT_FROM} = FACTORY; then run factory_nfs;else run boot_mmc;fi;fi"
 CONFIG_MISC_INIT_R=y
 CONFIG_SPL_BOOTCOUNT_LIMIT=y
 # CONFIG_SYS_MMCSD_RAW_MODE_U_BOOT_USE_SECTOR is not set