phy: phy-snps-eusb2: refactor constructs names

As the driver now resides outside the phy subdirectory under a different
name, refactor all definitions, structures and functions to explicitly
specify what code is Qualcomm-specific and what is not.

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/20250504144527.1723980-5-ivo.ivanov.ivanov1@gmail.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

Author: ivoszbg