serial: msm-geni: correct oversampling value based on QUP hardware revision

serial: msm-geni: correct oversampling value based on QUP hardware revision

Starting from QUP v2.5 the value of oversampling is changed from 32
to 16, keeping the old value on newer platforms results on wrong set
UART IP clock divider, thus the asked baudrate does not correspond to
the actually set with all the consequencies for a user.

The change links the driver to a new Qualcomm GENI SE QUP driver
to get its hardware version and update the oversampling value.

Deliberately the code under CONFIG_DEBUG_UART_MSM_GENI is not touched,
since a wanted baudrate can be controlled by setting a modified
CONFIG_DEBUG_UART_CLOCK build time variable.

Signed-off-by: Vladimir Zapolskiy <vladimir.zapolskiy@linaro.org>