tty: serial: amba-pl011: Remove QDF2xxx workarounds

tty: serial: amba-pl011: Remove QDF2xxx workarounds

This SoC family was destined for server use, featuring Qualcomm's very
interesting Kryo cores (before "Kryo" became a marketing term for Arm
cores with small modifications). It did however not leave the labs of
Qualcomm and presumably some partners, nor was it ever productized.

Remove the workarounds, as they are long obsolete.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Link: https://lore.kernel.org/r/20240122-topic-qdf_cleanup_tty-v1-1-0415503184be@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>