msm: kgsl: Continue looking for free address map after overflows

If address range overflow is detected when looking for a free
address map then don't discontinue after this failure because
the search can continue after changing options like alignment/
top-down/bottom-up.

Change-Id: I96214a88e3e9c05c16ecd08440e37508bb238094
Signed-off-by: Shubhraprakash Das <sadas@codeaurora.org>