Remove unneeded version.h includes from arch/arm/

It was pointed out by 'make versioncheck' that some includes of
linux/version.h are not needed in arch/arm/.
This patch removes them.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>