firmware-fairphone-fp5: add adreno firmware subpackage (MR 4456)

Package the zap shader firmware needed on this device.

device/testing/firmware-fairphone-fp5/APKBUILD

 pkgname=firmware-fairphone-fp5
 pkgver=20230822
-pkgrel=0
+pkgrel=1
 pkgdesc="Firmware for Fairphone 5"
 subpackages="
+	$pkgname-adreno
 	$pkgname-adsp
 	$pkgname-bluetooth
 	$pkgname-cdsp
@@ -24,6 +25,13 @@ package() {
 	mkdir -p "$pkgdir"
 }
 
+adreno() {
+	pkgdesc="Fairphone 5 adreno firmware"
+
+	install -Dm644 "$builddir"/a660_zap.* -t \
+		"$subpkgdir/lib/firmware/qcom/qcm6490/fairphone5/"
+}
+
 adsp() {
 	pkgdesc="Fairphone 5 adsp firmware"