ANDROID: vendor_hooks: add hooks for exting task's swp_entrys

The process exit time is mainly caused by freeing its swp_entrys. When low memory triggers to kill lots of processes exit simultaneously, there is a problem of CPU high load occupied by the exiting processes.

This feature is used to asynchronously maintain and release the swp_entrys of the exiting process to accelerate the efficiency of the exiting process.

Bug: 418960020
Bug: 340798358
Bug: 341232502
Change-Id: I6fc0b813e7ac6a0796e08ce7a17d5ff3ab2b799b
Signed-off-by: Qianfeng Rong <rongqianfeng@vivo.corp-partner.google.com>
(cherry picked from commit e5475062)