Revert "tty: serial: amba-pl011: Remove QDF2xxx workarounds"

Revert "tty: serial: amba-pl011: Remove QDF2xxx workarounds"

The original commit assumed this hardware is long rotting in the
junkyards, but apparently Qualcomm is still using some of these old
servers internally and the thing can still run upstream.

Adding insult to injury, I apparently managed to overdelete code and broke
non-QDF2xxx platforms [1].

Revert the removal to keep things going, at least for now.

This reverts commit 196f34af2bf4c87ac4299a9775503d81b446980c.

[1] https://lore.kernel.org/lkml/20240131213543.958051-1-m.szyprowski@samsung.com/

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
Tested-by: Mark Brown <broonie@kernel.org>
Link: https://lore.kernel.org/r/20240201-topic-qdf24xx_is_back_apparently-v1-1-edb112a2ef90@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>