msm: kgsl: Clean up snapshot GPU object output

Use a iterator to cleanup how snapshot GPU objects are printed.
This removes a ton of ugly math, and allows us to do subtle
silly things like add padding at the end of a non dword
aligned object.

Change-Id: Ic0dedbadabeee50f42fe9be62ea0b7dfc1f333da
Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>