Nokia RX-51: Enable CONFIG_SUPPORT_RAW_INITRD

This enable booting of Debian systems which use raw initrd image (instead
of uInitrd created by mkimage). This change increase size of u-boot.bin
binary by just 64 bytes.

Signed-off-by: Pali Rohár <pali@kernel.org>
diff --git a/configs/nokia_rx51_defconfig b/configs/nokia_rx51_defconfig
index d5688c7..2e80688 100644
--- a/configs/nokia_rx51_defconfig
+++ b/configs/nokia_rx51_defconfig
@@ -18,6 +18,7 @@
 CONFIG_LTO=y
 # CONFIG_SYS_MALLOC_F is not set
 # CONFIG_FIT is not set
+CONFIG_SUPPORT_RAW_INITRD=y
 CONFIG_BOOTDELAY=30
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_MENU_SHOW=y