[MIPS] Recognize DT_MIPS_XHASH dynamic table tag

LLVM tools do not emit `DT_MIPS_XHASH` dynamic table tag. But now
`llvm-objdump` and `llvm-readelf` recognize this tag and print it.

Fixes https://github.com/llvm/llvm-project/issues/53996

(cherry picked from commit 3c840e3c)