phy: phy-snps-eusb2: clean up error messages

phy: phy-snps-eusb2: clean up error messages

Clean up the error messages by using a consistent format with a colon
followed by a space and an errno (or unsupported frequency).

Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Reviewed-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Abel Vesa <abel.vesa@linaro.org>
Link: https://lore.kernel.org/r/20250523084839.11015-5-johan+linaro@kernel.org
Signed-off-by: Vinod Koul <vkoul@kernel.org>