ARM: rmobile: Convert Gen2 Stout, Porter, Silk to DM_SPI{,_FLASH}

Enable DM_SPI and DM_SPI_FLASH in U-Boot on H2 Stout, M2W Porter and E3 Silk.

Signed-off-by: Marek Vasut <marek.vasut+renesas@gmail.com>
Cc: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>
diff --git a/include/configs/rcar-gen2-common.h b/include/configs/rcar-gen2-common.h
index d606da8..9213d33 100644
--- a/include/configs/rcar-gen2-common.h
+++ b/include/configs/rcar-gen2-common.h
@@ -53,6 +53,8 @@
 /* SF MTD */
 #if defined(CONFIG_SPI_FLASH_MTD) && !defined(CONFIG_SPL_BUILD)
 #else
+#undef CONFIG_DM_SPI
+#undef CONFIG_DM_SPI_FLASH
 #undef CONFIG_SPI_FLASH_MTD
 #endif