usb: chipidea: core: show the real pointer value for register

The pointer value is "ptrval" like below at current code:
ci_hdrc ci_hdrc.0: ChipIdea HDRC found, revision: 25, lpm: 0;
cap: (ptrval) op: (ptrval)

According to Documentation/core-api/printk-formats.rst, we change
it from %p to %px for real value.

Signed-off-by: Peter Chen <peter.chen@nxp.com>