media: Revert "media: ccs-pll: Fix MODULE_LICENSE"

This reverts commit b3c0115e.

As per Documentation/process/license-rules.rst "GPL v2" exists only for
historical reasons and has the same meaning as "GPL". So revert this
patch.

Signed-off-by: Sakari Ailus <sakari.ailus@linux.intel.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>