phy: qcom: m31-eusb2: Fix the error log while enabling clock

While enabling clock, we incorrectly log 'ref clk' as 'cfg ahb clk'
Fix this since the devicetree bindings mentions it as ref clock.

Signed-off-by: Prashanth K <prashanth.k@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20250826105254.3758803-1-prashanth.k@oss.qualcomm.com


Signed-off-by: Vinod Koul <vkoul@kernel.org>