packagegroup-mchp-graphics: set PACKAGE_ARCH to MACHINE_ARCH

Fix build error caused by dependency on dynamically renamed packages (e.g.,
libdrm → libdrm2). Since the packagegroup depends on machine- specific
components, mark it as MACHINE_ARCH instead of allarch to ensure proper
packaging.

Signed-off-by: Dharma Balasubiramani <dharma.b@microchip.com>

Author: Dharma Balasubiramani

meta-mchp-common/recipes-mchp/packagegroups/packagegroup-mchp-graphics.bb

@@ -1,5 +1,7 @@
 SUMMARY = "Package group for graphics software and libraries."
 
+PACKAGE_ARCH = "${MACHINE_ARCH}"
+
 inherit packagegroup
 
 PROVIDES = "${PACKAGES}"