sony-amami: use linux-postmarketos-qcom-msm8974 for mainline (!1064)

This device is probably broken at this point, but since we want to
remove linux-postmarketos-mainline/stable it really has best chances
to work (somewhat) on linux-postmarketos-qcom-msm8974.

device/testing/device-sony-amami/APKBUILD

@@ -2,7 +2,7 @@
 # Contributor: Attila Szöllősi <ata@openmailbox.org>
 pkgname=device-sony-amami
 pkgver=3
-pkgrel=6
+pkgrel=7
 pkgdesc="Sony Xperia Z1 Compact"
 url="https://postmarketos.org"
 arch="armv7"
@@ -37,7 +37,7 @@ kernel_downstream() {
 
 kernel_mainline() {
 	pkgdesc="For kernel development only (most features aren't working)"
-	depends="linux-postmarketos-mainline"
+	depends="linux-postmarketos-qcom-msm8974"
 	devicepkg_subpackage_kernel $startdir $pkgname $subpkgname
 }