ANDROID: vendor_hooks: Add hook to precisely control readahead

Add vendor hooks to precisely control readahead based on various
factors, such as filesystem type, file type, process priority, and
other considerations.

Bug: 387208968
Bug: 388370909
Change-Id: I3016c5e0da487ae03b760dce4f6dbc0d90f145b3
Signed-off-by: Yang Yang <yang.yang@vivo.com>
(cherry picked from commit d005368a)
Signed-off-by: ying zuxin <11154159@vivo.com>