oem-amd: firmware files + modules -> initfs-extra (MR 4796)

Move the files to initramfs-extra, so the initramfs is not too big for
ChromeOS devices. I had initially added this to initramfs, because
otherwise the graphics on my Thinkpad L14 would not come up. But I
verified that it also works with having it in initramfs-extra.

Fixes: #2578

device/community/oem-amd/APKBUILD

@@ -2,7 +2,7 @@
 pkgname=oem-amd
 pkgdesc="AMD device support"
 pkgver=2
-pkgrel=0
+pkgrel=1
 url="https://postmarketos.org"
 license="MIT"
 arch="x86_64"
@@ -26,9 +26,9 @@ source="
 package() {
 	mkdir -p "$pkgdir"
 	install -Dm644 00-oem-amd.modules \
-		-t "$pkgdir"/usr/share/mkinitfs/modules
+		-t "$pkgdir"/usr/share/mkinitfs/modules-extra
 	install -Dm644 00-amdgpu-firmware.files \
-		-t "$pkgdir"/usr/share/mkinitfs/files
+		-t "$pkgdir"/usr/share/mkinitfs/files-extra
 }
 
 libva() {