Revert "tracing: Handle old buffer mappings for event strings and functions"

This reverts commit 680c07fa which is
commit 07714b4b 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: Ie8ef50e61b976ac5dc752de25a4c8fb94a41768a
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>