Fix bug as following on aarch64BE:
Error: operand 1 must be an integer register -- `rev v31.16b,v31.16b'
(From OE-Core rev: f29572f70a89fd88ab3898d334c126422b66755c)
Signed-off-by: Lei Maohui <leimaohui@cn.fujitsu.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>