phy: Add MSM8996 support to Qualcomm QUSB2 phy

phy: Add MSM8996 support to Qualcomm QUSB2 phy

This change is imported from Linux driver and tested with SM6125 SoC.
Note, the msm8996_phy_cfg struct is same as sdm660_phy_cfg but
qusb2_phy_cfg::se_clk_scheme_default differs only.

Signed-off-by: Biswapriyo Nath <nathbappai@gmail.com>
Reviewed-by: Casey Connolly <casey.connolly@linaro.org>
Reviewed-by: Sumit Garg <sumit.garg@oss.qualcomm.com>
Link: https://patch.msgid.link/20251207184919.12202-1-nathbappai@gmail.com
Signed-off-by: Casey Connolly <casey.connolly@linaro.org>