Revert "net: Introduce parse_protocol header_ops callback"

This reverts commit 6eef1252 which is
commit e78b2915 upstream.

This breaks the ABI and is not needed in the android-4.19-stable branch
as the issue it was added for is not relevant here.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: I56c67b283aa119d80c5f013a274622e8c6bdf2a0