rockchip: rk3328: defconfig: remove SPL raw image support

RK3328 SPL only support FIT image for ATF bl31.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/configs/rock64-rk3328_defconfig b/configs/rock64-rk3328_defconfig
index e895859..3ab0af1 100644
--- a/configs/rock64-rk3328_defconfig
+++ b/configs/rock64-rk3328_defconfig
@@ -21,6 +21,7 @@
 CONFIG_DEFAULT_FDT_FILE="rockchip/rk3328-rock64.dtb"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+# CONFIG_SPL_RAW_IMAGE_SUPPORT is not set
 CONFIG_TPL_SYS_MALLOC_SIMPLE=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_ATF=y