Remove unneeded version.h include from drivers/staging/hv/hv_timesource.c

It was pointed out by 'make versioncheck' that include of
linux/version.h is not needed in drivers/staging/hv/hv_timesource.c .
This patch removes it.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>