arm64: zynqmp: Enable SPI support in SPL for zcu104

It is enabling this mode but full boot is not validated yet.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

configs/xilinx_zynqmp_zcu104_revC_defconfig

@@ -5,6 +5,8 @@ CONFIG_SYS_MALLOC_F_LEN=0x8000
 CONFIG_SPL=y
 CONFIG_DEBUG_UART_BASE=0xff000000
 CONFIG_DEBUG_UART_CLOCK=100000000
+CONFIG_SPL_SPI_FLASH_SUPPORT=y
+CONFIG_SPL_SPI_SUPPORT=y
 CONFIG_ZYNQMP_USB=y
 CONFIG_DEBUG_UART=y
 CONFIG_AHCI=y
@@ -16,6 +18,7 @@ CONFIG_SPL_LOAD_FIT=y
 CONFIG_SPL_OS_BOOT=y
 CONFIG_SPL_RAM_SUPPORT=y
 CONFIG_SPL_RAM_DEVICE=y
+CONFIG_SPL_SPI_LOAD=y
 CONFIG_SPL_ATF=y
 CONFIG_SYS_PROMPT="ZynqMP> "
 CONFIG_CMD_MEMTEST=y