Add "restorecon_recursive /cache/recovery" to init.rc to avoid wrong SELinux context

[Benjamin Chen]

The permission of the directory /cache/recovery and files in it is changed from cache_file to cache_recovery_file by this change:
https://android.googlesource.com/platform/system/sepolicy/+/549ccf77e3fd23bb6c690da7023441c1007c4fd8%5E%21/#F4

If the directory /cache/recovery is removed and recreated, it will inherit the SELinux context of its parent:

# ls -Z /cache
u:object_r:cache_private_backup_file:s0 backup
u:object_r:cache_backup_file:s0         backup_stage
u:object_r:cache_file:s0                lost+found
u:object_r:cache_recovery_file:s0       recovery
# rmdir /cache/recovery/
# mkdir /cache/recovery                                                
# ls -Z /cache                                                          
u:object_r:cache_private_backup_file:s0 backup
u:object_r:cache_backup_file:s0         backup_stage
u:object_r:cache_file:s0                lost+found
u:object_r:cache_file:s0                recovery

"restorecon_recursive /cache" in init.rc will not fix this:

[    3.386256]  (4)[1:init]init: SELinux: Skipping restorecon_recursive(/cache)
[    3.387131]  (4)[1:init]init: Command 'restorecon_recursive /cache' action=post-fs (/init.rc:289) returned 0 took 0.00s

$ adb shell ls -Z /cache
u:object_r:cache_private_backup_file:s0 backup
u:object_r:cache_backup_file:s0         backup_stage
u:object_r:cache_file:s0                lost+found
u:object_r:cache_file:s0                recovery

"restorecon_recursive /cache/recovery" can fix this:

[    3.781207]  (4)[1:init]init: Command 'restorecon_recursive /cache/recovery' action=post-fs (/init.rc:296) returned 0 took 0.00s

$ adb shell ls -Z /cache
u:object_r:cache_private_backup_file:s0 backup
u:object_r:cache_backup_file:s0         backup_stage
u:object_r:cache_file:s0                lost+found
u:object_r:cache_recovery_file:s0       recovery

Should "restorecon_recursive /cache/recovery" need to be added in init.rc?