Revert "x86: Fix get_wchan() to support the ORC unwinder"

Revert "x86: Fix get_wchan() to support the ORC unwinder"

This reverts commit f270511247a5b6257b84db17883e0b1189bf5e16 which is
commit bc9bbb81730ea667c31c5b284f95ee312bab466f upstream.

It has been reported to be causing problems, and is being reworked
upstream and has been dropped from the current 5.15.y stable queue until
it gets resolved.

Reported-by: Chris Rankin <rankincj@gmail.com>
Reported-by: Thorsten Leemhuis <linux@leemhuis.info>
Link: https://lore.kernel.org/r/ed000478-2a60-0066-c337-a04bffc112b1@leemhuis.info
Cc: Qi Zheng <zhengqi.arch@bytedance.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Peter Zijlstra (Intel) <peterz@infradead.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Sasha Levin <sashal@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>