NOUPSTREAM: ANDROID: net: NET related vendor hooks

  android_vh_ptype_head:
    To add a debugging chain to ptype list

  android_vh_kfree_skb
    To sniff the dropped packet at kernel network

[CPNOTE: 04/08/21] Lee: Vendor hooks

Bug: 163716381

Signed-off-by: Bae Soukjin <soukjin.bae@samsung.com>
Change-Id: Ide80bf0a129da31a1824d4a33026ac42be327361
(cherry picked from commit d88b2969)
(cherry picked from commit a8021ba6)
Signed-off-by: Lee Jones <joneslee@google.com>