Revert "ALSA: pcm: Add more disconnection checks at file ops"

This reverts commit f0294f44 which is
commit 36df2427 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: I4c7442f3f9fc389298fa71d5bd41999588541e42
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>