arm: socfpga: Enable SPL MMC/SPI support only if DM_MMC/SPI is enabled

It is not possible to compile MMC/SPI SPL if the respective DM_MMC/DM_SPI
bits are not enabled. Secure the code with an ifdef to prevent compiler
splat.

Signed-off-by: Marek Vasut <marex@denx.de>
Cc: Dinh Nguyen <dinguyen@opensource.altera.com>
Cc: Chin Liang See <clsee@altera.com>

include/configs/socfpga_common.h

@@ -330,8 +330,12 @@ unsigned int cm_get_qspi_controller_clk_hz(void);
 #define CONFIG_SPL_LIBGENERIC_SUPPORT
 #define CONFIG_SPL_WATCHDOG_SUPPORT
 #define CONFIG_SPL_SERIAL_SUPPORT
+#ifdef CONFIG_DM_MMC
 #define CONFIG_SPL_MMC_SUPPORT
+#endif
+#ifdef CONFIG_DM_SPI
 #define CONFIG_SPL_SPI_SUPPORT
+#endif
 
 /* SPL SDMMC boot support */
 #ifdef CONFIG_SPL_MMC_SUPPORT