Revert "PCI: Store all PCIe Supported Link Speeds"

This reverts commit 47ecb8f8 which is
commit d2bd39c0 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: Ic902afd81e7011805ff3f84237a01b1b1cbb06a9
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>