configs: socfpga: disable EFI and ISO partition types

None of the SoCFPGA platforms will support EFI/ISO partition types that
is needed for DISTRO_DEFAULTS. SoCFPGA bootroom will only support 0xa2
partition type.

This is needed to help limit the size of the SPL to within the 64k limit
that is required for SoCFPGA.

Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
diff --git a/configs/socfpga_sockit_defconfig b/configs/socfpga_sockit_defconfig
index ca739f7..49d9db8 100644
--- a/configs/socfpga_sockit_defconfig
+++ b/configs/socfpga_sockit_defconfig
@@ -23,6 +23,8 @@
 CONFIG_CMD_GREPENV=y
 CONFIG_CMD_DFU=y
 # CONFIG_CMD_FLASH is not set
+# CONFIG_ISO_PARTITION is not set
+# CONFIG_EFI_PARTITION is not set
 CONFIG_CMD_GPIO=y
 CONFIG_CMD_I2C=y
 CONFIG_CMD_MMC=y