diag: Change format used for printing pointers

Currently, when printing a pointer address the format does not
take advantage of using the pointer conversion specifier. Make
changes to use the pointer conversion specifier.

Change-Id: I27fd10c33952de9e44066c15256c7f29df6c4dd8
Signed-off-by: Ravi Aravamudhan <aravamud@codeaurora.org>