Revert "PCI: Honor Max Link Speed when determining supported speeds"

This reverts commit 25ae311e which is
commit 3202ca22 upstream.

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

Bug: 161946584
Change-Id: I36d9d4e5341e33474cbef17045e95fed15563042
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>