Mips: Reuse atexit.h from libc/arch-common

Change-Id: Ica1670e6d3d1b6b0c64df93720efa65586e67727
Merge "Mips: Reuse atexit.h from libc/arch-common"
Mips: Remove unused files

Change-Id: If98b832ee32f6dcd9f5d7ae21c601c210adfad6b
Merge "Mips: Remove unused files"