serial: msm_geni_serial: Manage HSUART clocks when read HW Ver

This change is to make sure UART doesn't turn on/off clocks for
console usecase. HSUART tries to store firmware version for debug
purpose which needs clocks to be ON, hence keep reading of FW
version only for HSUART.

Change-Id: I95025872852df3eb5b8252dfe1cc6f5be95586be
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>