package/pipewire: add libva optional dependency

libva is an optional dependency of spa, see:
https://github.com/PipeWire/pipewire/blob/0.2.7/spa/meson.build

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/pipewire/pipewire.mk

@@ -15,6 +15,10 @@ ifeq ($(BR2_PACKAGE_FFMPEG),y)
 PIPEWIRE_DEPENDENCIES += ffmpeg
 endif
 
+ifeq ($(BR2_PACKAGE_LIBVA),y)
+PIPEWIRE_DEPENDENCIES += libva
+endif
+
 ifeq ($(BR2_PACKAGE_SBC),y)
 PIPEWIRE_DEPENDENCIES += sbc
 endif