serial: msm_geni_serial: Enhance debug logs and support

This patch adds useful and optimal debug logs at correct places.
Also adds HW version check and rectifies existing logs. In addition
added support to extract FW and HW verion from the adb shell which
can help in future debug.

Change-Id: I0c9fb55bf78bf34b2ae9071d36f5ec9703be2778
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>