[POWERPC] Add MODULE_LICENSE to powerpc/sysdev/rtc_cmos_setup.c

This adds the missing MODULE_LICENSE("GPL").
Signed-off-by: Adrian Bunk <bunk@kernel.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>

arch/powerpc/sysdev/rtc_cmos_setup.c

@@ -56,3 +56,5 @@ static int  __init add_rtc(void)
 	return 0;
 }
 fs_initcall(add_rtc);
+
+MODULE_LICENSE("GPL");