usb: phy: Enable clock before accessing EUD register space

Currently driver is accessing EUD register space without enabling
AHB2PHY clock which is resulting in NOC errors. This change enables PHY
clocks before accessing EUD register space.

Change-Id: I9f20e8459f6ad691798f68dd9437548c20909211
Signed-off-by: Pratham Pratap <quic_ppratap@quicinc.com>