ARM: orion5x: multiplatform support

The orion5x platform is now ready to be enabled for multiplatform
support, this patch does the switch over by modifying the Kconfig file,
the defconfig and removing the last mach/*.h header that becomes obsolete
with this.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Acked-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@free-electrons.com>
diff --git a/arch/arm/configs/orion5x_defconfig b/arch/arm/configs/orion5x_defconfig
index 8099417..6ddca88 100644
--- a/arch/arm/configs/orion5x_defconfig
+++ b/arch/arm/configs/orion5x_defconfig
@@ -13,6 +13,9 @@
 # CONFIG_BLK_DEV_BSG is not set
 CONFIG_PARTITION_ADVANCED=y
 CONFIG_BSD_DISKLABEL=y
+CONFIG_ARCH_MULTI_V5=y
+# CONFIG_ARCH_MULTI_V6 is not set
+# CONFIG_ARCH_MULTI_V7 is not set
 CONFIG_ARCH_ORION5X=y
 CONFIG_ARCH_ORION5X_DT=y
 CONFIG_MACH_DB88F5281=y