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DmaHeap class is useful outside the RPi pipeline handler too. Move dma_heaps.h and dma_heaps.cpp to common directories. Update the build files and RPi vc4 pipeline handler accordingly. Tested-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org> # sc8280xp Lenovo x13s Tested-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com> Reviewed-by: Naushir Patuck <naush@raspberrypi.com> Reviewed-by: Pavel Machek <pavel@ucw.cz> Reviewed-by: Milan Zamazal <mzamazal@redhat.com> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com> Signed-off-by: Andrey Konovalov <andrey.konovalov@linaro.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Kieran Bingham <kieran.bingham@ideasonboard.com>