phy: phy-rockchip-inno-usb2: simplify getting match data

Simplify the code by directly getting the match data via
device_get_match_data() instead of open coding its functionality.

Signed-off-by: Sebastian Reichel <sebastian.reichel@collabora.com>
Link: https://lore.kernel.org/r/20230522170324.61349-7-sebastian.reichel@collabora.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>