msm_fb: Increase base fence timeout

The earlier value of 1 second caused unnecessary warnings on
heavy workloads by the GPU.

Change-Id: Ib4a5b098267251d5c63c4d8d2a2f51b339acc1d2
Signed-off-by: Naseer Ahmed <naseer@codeaurora.org>
Signed-off-by: Lynus Vaz <lvaz@codeaurora.org>