Revert "thermal/core: Fix memory leak in __thermal_cooling_device_register()"

This reverts commit 18530bed which is
commit 98a160e8 upstream.

It breaks the Android kernel ABI and is not needed for Android devices,
so it is safe to revert for now.  If it is determined that it is needed
in the future, it can be brought back in an abi-preserving way.

Bug: 161946584
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>
Change-Id: Iba9a1c4019b19674fc3f9520b31e4e43be30c847