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The 'net_raw' GID is an Android addition that does not exist
upstream. Moreover, 'hostapd' is already getting CAP_NET_RAW as a file
capability in
https://cs.corp.google.com/android/system/core/libcutils/fs_config.c?l=161.
Not only that, but 'hostapd' needs both CAP_NET_ADMIN *and*
CAP_NET_RAW, and the .rc file was only granting 'net_raw'. Remove
'net_raw' and just use file capabilities. This will allow us to drop
those kernel patches.

Bug: 33938230
Test: 'start hostapd', 'cat /proc/`pgrep hostapd`/status | grep Cap'.
Test: "CapPrm", "CapEff" lines show correct mask: 0000000000003000.
Change-Id: I19a3b28993abc9588c2269a513e78aa565a25ece