arm: rmobile: Add BLANCHE board support

BLANCHE is development board based on R-Car V2H SoC (R8A7792)

This commit supports the following periherals:
- SCIF, Ethernet, QSPI, MMC

Signed-off-by: Masakazu Mochizuki <masakazu.mochizuki.wd@hitachi.com>
Signed-off-by: Nobuhiro Iwamatsu <iwamatsu@nigauri.org>

board/renesas/blanche/Kconfig

@@ -0,0 +1,12 @@
+if TARGET_BLANCHE
+
+config SYS_BOARD
+	default "blanche"
+
+config SYS_VENDOR
+	default "renesas"
+
+config SYS_CONFIG_NAME
+	default "blanche"
+
+endif