keystone2: spi: do not define DM_SPI and DM_SPI_FLASH for SPL build

Since Keystone2 devices do not have support DM in SPL, do not define
DM_SPI and DM_SPI_FLASH for SPL build.

Signed-off-by: Vignesh R <vigneshr@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jagan Teki <jteki@openedev.com>
diff --git a/include/configs/ti_armv7_keystone2.h b/include/configs/ti_armv7_keystone2.h
index 2ee26c4..4aa262e 100644
--- a/include/configs/ti_armv7_keystone2.h
+++ b/include/configs/ti_armv7_keystone2.h
@@ -89,6 +89,10 @@
 #define CONFIG_SYS_SPI2
 #define CONFIG_SYS_SPI2_BASE		KS2_SPI2_BASE
 #define CONFIG_SYS_SPI2_NUM_CS		4
+#ifdef CONFIG_SPL_BUILD
+#undef CONFIG_DM_SPI
+#undef CONFIG_DM_SPI_FLASH
+#endif
 
 /* Network Configuration */
 #define CONFIG_PHYLIB