phy: qcom: qmp-combo: drop qmp_v6_dp_aux_init()

The only difference between qmp_v6_dp_aux_init() and
qmp_v4_dp_aux_init() is the address of COM_BIAS_EN_CLKBUFLR_EN register.
Move it to register layout and drop the duplicate function.

Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Link: https://lore.kernel.org/r/20230621153317.1025914-7-dmitry.baryshkov@linaro.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>