board: sl28: enable EFI UpdateCapsule support

Enable support for update over EFI UpdateCapsule mechanism. This board
doesn't support setting EFI variables after ExitBootservices().
Therefore, we are also enabling EFI_IGNORE_OSINDICATIONS.

Signed-off-by: Michael Walle <michael@walle.cc>
[Rebased]
Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
diff --git a/configs/kontron_sl28_defconfig b/configs/kontron_sl28_defconfig
index f24051a..4689d44 100644
--- a/configs/kontron_sl28_defconfig
+++ b/configs/kontron_sl28_defconfig
@@ -64,6 +64,8 @@
 CONFIG_SYS_FSL_DDR3=y
 CONFIG_DDR_ECC=y
 CONFIG_ECC_INIT_VIA_DDRCONTROLLER=y
+CONFIG_DFU_MMC=y
+CONFIG_DFU_SF=y
 CONFIG_I2C_SET_DEFAULT_BUS_NUM=y
 CONFIG_I2C_MUX=y
 CONFIG_MMC_HS400_SUPPORT=y
@@ -95,3 +97,7 @@
 CONFIG_OF_LIBFDT_ASSUME_MASK=0x0
 CONFIG_OF_LIBFDT_OVERLAY=y
 CONFIG_EFI_SET_TIME=y
+CONFIG_EFI_RUNTIME_UPDATE_CAPSULE=y
+CONFIG_EFI_CAPSULE_ON_DISK=y
+CONFIG_EFI_IGNORE_OSINDICATIONS=y
+CONFIG_EFI_CAPSULE_FIRMWARE_FIT=y