recovery: fix denials during factory reset

Addresses these denials when wiping data on sailfish:

avc:  denied  { open } for  pid=488 comm="mke2fs_static"
path="/proc/swaps" dev="proc" ino=4026532415 scontext=u:r:recovery:s0
tcontext=u:object_r:proc_swaps:s0 tclass=file permissive=1

avc:  denied  { search } for  pid=488 comm="mke2fs_static"
name="features" dev="sysfs" ino=30084 scontext=u:r:recovery:s0
tcontext=u:object_r:sysfs_fs_ext4_features:s0 tclass=dir permissive=1

avc:  denied  { read } for  pid=488 comm="mke2fs_static"
name="lazy_itable_init" dev="sysfs" ino=30085 scontext=u:r:recovery:s0
tcontext=u:object_r:sysfs_fs_ext4_features:s0 tclass=file permissive=1

Test: Wipe data/factory reset -> no selinux denials
Change-Id: Ia9e2e4fd4a1c604c9286a558ef0fe43fd153e3bc