fix build error

modules/mali/DX910-SW-99002-r3p2-01rel0/driver/src/devicedrv/ump/common/ump_kernel_common.o

Reference:
http://bbs.csdn.net/topics/390437613

http://www.armboard.org/forum.php?mod=viewthread&tid=288
https://github.com/Pivosgroup/buildroot-linux-kernel/commit/1524a2dc8bfbee683384996f434a2a991416c1df
http://mail.olimex.com/forum/index.php?topic=1625.0