staging: gdm724x: Remove tests of KERNELVERSION

Kernel code need not test for KERNELVERSION. Besides being unnecessary
for an in-kernel driver, these lines will cause a build failure for any
source tree with a stale include/linux/version.h.

This patch is only compile tested.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>