Revert "arch: Convert formatter strings to use PRI defines"

This reverts commit da8bff6b.

We revert this as we intent to move away from {u}int{8,16,32,64}_t types
to our own internal types for sized variables so we shouldn't need the
PRI macros anymore.

Change-Id: Ibb1fae7500bddb4772b8830d497a0e5f78b44bcc
Signed-off-by: Kumar Gala <kumar.gala@linaro.org>