ANDROID: GKI: fix up sysctl_vals ABI change.

In commit 1ac6e9ee ("sysctl: move some boundary constants from
sysctl.c to sysctl_vals"), the sysctl_vals variable got changed, but
unfortunatly many Android vendors liked using that array.  To preserve
the ABI, put the array back the way it was and rename the new change to
be `android_gki_sysctl_vals` instead, and move the #defines to use it.

This way if any external code is rebuilt, it will use the new symbols,
but if not, the old ones will still work just as before, not requiring a
rebuild at all.

Bug: 161946584
Fixes: 1ac6e9ee ("sysctl: move some boundary constants from sysctl.c to sysctl_vals")
Change-Id: Ib094ae03682e11fee4f0b06af362541bbcba24d5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>