phy: phy-snps-eusb2: split phy init code

phy: phy-snps-eusb2: split phy init code

The current phy init consists of hardware power-up, as well as
QCOM-specific eUSB2 init code. Split it into two parts, to make room
for such non-QCOM init code.

Signed-off-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250504144527.1723980-6-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>