Reverting rmnet, incrementalfs changes from android-4.19.112

5043d35d net: rmnet: fix packet forwarding in rmnet bridge mode
8cf81bf8 net: rmnet: fix bridge mode bugs
79978164 net: rmnet: use upper/lower device infrastructure
48c5bfbb net: rmnet: do not allow to change mux id if mux id is duplicated
7111ec09 net: rmnet: remove rcu_read_lock in rmnet_force_unassociate_device()
5cd211aa net: rmnet: fix suspicious RCU usage
be045358 net: rmnet: fix NULL pointer dereference in rmnet_changelink()
71ae5b69 net: rmnet: fix NULL pointer dereference in rmnet_newlink()
1530be50 ANDROID: Incremental fs: Add INCFS_IOC_PERMIT_FILL
73e7d656 ANDROID: Incremental fs: Remove signature checks from kernel
53809634 ANDROID: Incremental fs: Pad hash blocks
70539f7c ANDROID: Incremental fs: Make fill block an ioctl
e2999b39 ANDROID: Incremental fs: Remove all access_ok checks

Change-Id: I4d874a3e4f146064031bfa63a611b0832e9ec82a
Signed-off-by: Srinivasarao P <spathi@codeaurora.org>