pdl: Move get_uint and put_uint to common module

We will need access to both of them from the parser next.

Test: atest pdl_tests pdl_rust_generator_tests_{le,be}
(cherry picked from https://android-review.googlesource.com/q/commit:d69fc851ce8ba4ef22b1f0ad4c4b4b54478a3eaf)
Merged-In: I7cfd79f2ef811765cd7b3653b8ed1b0ddb14fc70
Change-Id: I7cfd79f2ef811765cd7b3653b8ed1b0ddb14fc70