qcom-geni-se: Avoid dumping of GENI registers in console

In UART usecase, The file used for transfers can contain 0 bytes of data.
Current logic in serial driver will treat 0 byte data as RX invalid data
and dump GENI registers in console which can results into
watchdog crash.

This change will avoid logging of GENI registers in console.

Change-Id: Iaab405cf8534f86a3bcb5a5906a9b3a99e802fe1
Signed-off-by: Chandana Kishori Chiluveru <cchiluve@codeaurora.org>