ARM: 8381/1: fix ARMv4+Feroceon multiplatform build

The feroceon copypage implementation cannot be built when targetting an
ARMv4 CPU, so we need to pass the march=armv5te flag manually to gcc
when building this file. This is obviously safe since that code will
not be executed on ARMv4.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>