Revert "inet: shrink struct flowi_common"

This reverts commit afa49774 which is
commit 1726483b79a72e0150734d5367e4a0238bf8fcff upstream.

It breaks the android ABI, and isn't really needed for anything, so drop
it for now.

Bug: 157965270
Change-Id: Ied13ee54ff6dcc171642fc546f6435169b26df82
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>