This reverts the Tegra part of commit 797da559 (PM / devfreq: Add
COMPILE_TEST for build coverage) that introduced a build failute in
in linux-next.

[ rjw: Changelog ]
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>