Revert "sd: update the bdev size in sd_revalidate_disk"

This reverts commit afa920d4 which is
commit b200e38c 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: I53e0b8bf9da7c81b84ca91d43ff10b770510c5e5
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>