dra7xx_evm: qspi: do not define DM_SPI and DM_SPI_FLASH for spl

Since OMAP's spl doesn't support DM currently, do not define DM_SPI and
DM_SPI_FLASH for spl build.

Signed-off-by: Mugunthan V N <mugunthanvnm@ti.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>

include/configs/dra7xx_evm.h

@@ -142,6 +142,11 @@
 #define CONFIG_DEFAULT_SPI_MODE                SPI_MODE_3
 #define CONFIG_QSPI_QUAD_SUPPORT
 
+#ifdef CONFIG_SPL_BUILD
+#undef CONFIG_DM_SPI
+#undef CONFIG_DM_SPI_FLASH
+#endif
+
 /*
  * Default to using SPI for environment, etc.
  * 0x000000 - 0x010000 : QSPI.SPL (64KiB)