Revert "skb_expand_head() adjust skb->truesize incorrectly"

This reverts commit 43e7958c which is
commit 7f678def99d29c520418607509bb19c7fc96a6db upstream.

It breaks the Android kernel build and can be brought back in the future
in an abi-safe way if it is really needed.

Bug: 161946584
Change-Id: I21417bd6cf13432836618e2c0be84c79a9998b60
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>