[llvm-readobj][test] - Stop using few precompiled binaries in mips-got.test

This removes 4 input files (one source file and 3 precompiled binaries) from
`mips-got.test` (now YAMLs are used instead) and also makes the testing of
the GNU output a bit stricter (`--strict-whitespace --match-full-lines`).

Differential revision: https://reviews.llvm.org/D88488