serial: msm_geni_serial: Keep unique compatibility for QUPV3 UART Driver

Whenever console OR HSUART is disabled from the defconfig, additional
compatible string causes probe to be called for respective HSUART OR
console driver. Hence remove the unwanted compatible string from the
driver.

Change-Id: I202bdfb187126f110c308fb83fb2c28210b557f3
Signed-off-by: Mukesh Kumar Savaliya <msavaliy@codeaurora.org>