regulator: cpr-regulator: correct format string for physical addresses

Change the format string used when printing physical addresses
from %x to %pa.  This ensures that the driver can be compiled
when type phys_addr_t is larger than type int.

Change-Id: I004f58236b716731d366d6fdac8936d9beed33e2
Signed-off-by: David Collins <collinsd@codeaurora.org>