Revert "tracing/hist: Add poll(POLLIN) support on hist file"

This reverts commit 13edaf99 which is
commit 1bd13edb 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: Ic6c4d6bfb766e6d7d1791fdb934269058402214c
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>