package.bbclass: FILER* override syntax

pkgdata no longer includes FILERPROVIDES* nor
FILERDEPENDS*. Fix with new override syntax.

Also apply to FILERPROVIDESLIST and FILERDEPENDSLIST.

Signed-off-by: Tim Orling <timothy.t.orling@intel.com>
Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>