drm/amdkfd: change driver version to 0.7.2

#define KFD_DRIVER_AUTHOR	"AMD Inc. and others"

#define KFD_DRIVER_DESC		"Standalone HSA driver for AMD's GPUs"

#define KFD_DRIVER_DATE		"20150122"

#define KFD_DRIVER_DATE		"20150421"

#define KFD_DRIVER_MAJOR	0

#define KFD_DRIVER_MINOR	7

#define KFD_DRIVER_PATCHLEVEL	1

#define KFD_DRIVER_PATCHLEVEL	2

static const struct kgd2kfd_calls kgd2kfd = {

	.exit		= kgd2kfd_exit,