Revert "serial: 8250: Let drivers request full 16550A feature probing"

This reverts commit 63a3d75c which is
commit 9906890c upstream.

It breaks the kernel api and is something needed by Android systems, so
it can be reverted.

Bug: 161946584
Change-Id: I4706c2055bdff8679b40efd3590fcca5050c3b71
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>