mesa: fix panfrost driver build

mesa: fix panfrost driver build

Panfrost drivers require libclc, so let's force libclc to be present in
the PACKAGECONFIG to build the drivers.

Reported-by: Trevor Woerner <twoerner@gmail.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Tested-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Signed-off-by: Quentin Schulz <quentin.schulz@cherry.de>
Signed-off-by: Mathieu Dubois-Briand <mathieu.dubois-briand@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>