USB: gadget: Replace %pK with %pM

commit 7d08f0c4 ("usb: gadget: replace %p with
%pK") modifies the %pM (MAC address format specifier) as
%pKM in usb drivers. when usb composition switch happens
ecm function bind_config() access the invalid host's
ethernet address and leads usb enumeration failure. Fix
this by replace %pKM with %pM only for usb-eth module.

Change-Id: I29364891fbdf381b5a6ea360ecdbe3ef237f24bd
Signed-off-by: Arumuga Durai A <cadurai@codeaurora.org>