ANDROID: add hooks into blk-core.c for customized I/O scheduler

android_rvh_blk_allocated_queue_init: Allocate specific request_queue
information and save the pointer address in the ANDROID_OEM_DATA field.
The allocation process may be scheduled, so a restricted hook function
is used

android_rvh_blk_flush_plug_list: Flush the customized plug list. During
this process, the scheduled queue_rq will be called to process the
request, so a restricted hook function is used

Bug: 319582497

Change-Id: I0af3915de899b678ffd4f207cac2e35a744936b8
Signed-off-by: hao lv <hao.lv5@transsion.com>