device-fairphone-fp6: update kernel package name & remove append_dtb

The kernel package has been renamed, so update the dependency
accordingly.

And remove append_dtb, this was actually used with boot-deploy < 0.20.0
because deviceinfo_header_version="2" was ignored and therefore v0 was
used, which requires appended dtb. Now that boot-deploy is actually
passing this parameter, we do not have to append the dtb to the kernel
image anymore, because the dtb is passed in a separate field.

Part-of: <https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/7368>

device/testing/device-fairphone-fp6/APKBUILD

@@ -2,7 +2,7 @@
 # Maintainer: Luca Weiss <luca@lucaweiss.eu>
 pkgname=device-fairphone-fp6
 pkgdesc="The Fairphone (Gen. 6)"
-pkgver=3
+pkgver=4
 pkgrel=0
 url="https://postmarketos.org"
 license="MIT"
@@ -17,7 +17,7 @@ depends="
 	firmware-fairphone-fp6-modem
 	firmware-fairphone-fp6-venus
 	firmware-fairphone-fp6-wpss
-	linux-postmarketos-qcom-sm7635
+	linux-postmarketos-qcom-milos
 	make-dynpart-mappings
 	mkbootimg
 	postmarketos-base
@@ -44,6 +44,6 @@ package() {
 
 sha512sums="
 17533b261db6ead91b360e2d71355297fc3ad37f3fc68f6f03a8f7bb31e1ca82ecc403454aa360c7eace9164199086422f9e2d7507e24e4695caa8d3c117034f  00-mesa.sh
-4c9e8a1f56351ff316e85a65efb63766408c43d7c32f2f217cd3573ae8c6466c07950114ac5f98d6fbe739728cba2071c352150ab20318528df7dafe8a1a82c0  deviceinfo
+7bd8339e7ffd2da5b741d22d52e67d5ca80d5ddf3d6da8f732ba8ef33fdcf0e32815581321a5ce1e4103bb369f889010c251d8ee86f1a681bae0116b74c1edd7  deviceinfo
 c535c211a6d594605e0e2af3536e457b4b6a4b833f26efda4dbd514597d080393a621338c274173f4633eadefc0c2ae830f7ceaa4cbe56a1e6715ff825af18f1  modules-initfs
 "

device/testing/device-fairphone-fp6/deviceinfo

@@ -8,7 +8,6 @@ deviceinfo_manufacturer="Fairphone"
 deviceinfo_codename="fairphone-fp6"
 deviceinfo_year="2025"
 deviceinfo_dtb="qcom/milos-fairphone-fp6"
-deviceinfo_append_dtb="true"
 deviceinfo_arch="aarch64"
 deviceinfo_flash_kernel_on_update="true"