UML: Drop private round_down definition
UML: Drop private round_down definition

Already defined in kernel.h. The official version assumes that 'n' is
power of two - which it is in our case.

Signed-off-by: Jan Kiszka <a5b45c9af271d077f30d36aa7d9b988eed9d56eb@web.de>
Signed-off-by: Jiri Kosina <ed58f755cc8caaf10c3e8c731a8b86fb8f13d6cb@suse.cz>

TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas,KristFoundation/Programs,TeamVee-Kanas/android_kernel_samsung_kanas,TeamVee-Kanas/android_kernel_samsung_kanas