msm_geni_serial: reduce wakelock timeout from ISR to 100ms

Average userspace response time from ISR is less than 10ms.

Whooping 2 seconds is way too long. Reduce it to 100ms.

Change-Id: I78e1f434f6e5585497972ee82b2a29c5cfd87408
Signed-off-by: Park Ju Hyung <qkrwngud825@gmail.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>