usb: Avoid exposing kernel addresses

Usage of %p exposes the kernel addresses, an easy target to
kernel write vulnerabilities. With this patch currently
%pK prints only Zeros as address. If you need actual address
echo 0 > /proc/sys/kernel/kptr_restrict

addressing the info leak  issue under following CVEs
CVE-2016-8401, CVE-2016-8402, CVE-2016-8403,
CVE-2016-8404, CVE-2016-8405, CVE-2016-8406,
CVE-2016-8407

Change-Id: Iefe0639416275cfeca6e90b6f88cd0412bb76414
Signed-off-by: Ravi Kumar Siddojigari <rsiddoji@codeaurora.org>