serial: msm_geni_serial: Add Workqueue to dump the registers

Implement in a workqueue for switching IPC logs and dumping
the registers part of BT host TIOCFAULT ioctl call.

Change-Id: I3a9b1a2db9088287546f2c443ee48e756e7e2e16
Signed-off-by: Yatish Kumar Singh <yatishku@codeaurora.org>