firmware-fairphone-fp6: rename venus subpackage to vpu, update path

Neither the firmware binary, nor the Linux driver are called 'venus'
nowadays. Rename the package to VPU (video processing unit).

Also accordingly, don't rename the firmware to "venus.mbn" but keep the
original filename intact.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/8306>

device/testing/firmware-fairphone-fp6/APKBUILD

@@ -1,7 +1,7 @@
 maintainer="Luca Weiss <luca@lucaweiss.eu>"
 pkgname=firmware-fairphone-fp6
 pkgver=20250606
-pkgrel=2
+pkgrel=3
 pkgdesc="Firmware for The Fairphone (Gen. 6)"
 subpackages="
 	$pkgname-adreno
@@ -10,7 +10,7 @@ subpackages="
 	$pkgname-cdsp
 	$pkgname-ipa
 	$pkgname-modem
-	$pkgname-venus
+	$pkgname-vpu
 	$pkgname-wpss
 	"
 url="https://github.com/FairBlobs/FP6-firmware"
@@ -95,11 +95,11 @@ modem() {
 		-type f -exec chmod 0644 {} \;
 }
 
-venus() {
-	pkgdesc="The Fairphone (Gen. 6) venus firmware"
+vpu() {
+	pkgdesc="The Fairphone (Gen. 6) vpu firmware"
 
-	install -Dm644 "$builddir"/vpu20_2v.mbn \
-		"$subpkgdir/lib/firmware/qcom/milos/fairphone/fp6/venus.mbn"
+	install -Dm644 "$builddir"/vpu20_2v.mbn -t \
+		"$subpkgdir/lib/firmware/qcom/milos/fairphone/fp6/"
 }
 
 wpss() {