target/arm: add spaces around operator

Fix code style. Operator needs spaces both sides.

Backports bdc3b6f570e8bd219aa6a24a149b35a691e6986c
This commit is contained in:
Xinhao Zhang 2021-03-02 13:15:04 -05:00 committed by Lioncash
parent 348504c386
commit 492fbc4d2c