linux-postmarketos-qcom-msm8930: update to 6.15.0_rc7, fix building

Part-of: https://gitlab.postmarketos.org/postmarketOS/pmaports/-/merge_requests/6629

Closes https://gitlab.postmarketos.org/postmarketOS/pmaports/-/issues/3753

[ci:skip-build]: already built successfully in CI

device/testing/linux-postmarketos-qcom-msm8930/APKBUILD

@@ -4,7 +4,7 @@
 
 _flavor="postmarketos-qcom-msm8930"
 pkgname=linux-$_flavor
-pkgver=6.13.0
+pkgver=6.15.0_rc7
 pkgrel=0
 pkgdesc="Close-to-mainline kernel fork for Qualcomm MSM8930 devices"
 arch="armv7"
@@ -30,11 +30,11 @@ makedepends="
 "
 
 # Source
-_repository="linux-msm8930"
+_repository="linux"
 _config="config-$_flavor.$arch"
-_tag="22b00993309e5506552ed6c7b821bbe4d9493b9a"
+_tag="a5fa8fd179baf5374aa51e9a56a8f212bd9ea331"
 source="
-	$pkgname-$_tag.tar.gz::https://github.com/user0-07161/$_repository/archive/$_tag.tar.gz
+	$pkgname-$_tag.tar.gz::https://github.com/msm8227-mainline/$_repository/archive/$_tag.tar.gz
 	$_config
 "
 builddir="$srcdir/$_repository-$_tag"
@@ -65,6 +65,6 @@ package() {
 }
 
 sha512sums="
-410bb44e09c72231266c408294c4ce8369c376c12e57145da1dcede4d975de380a462e10aa04fd7da6a58524b6b1efb6a43a49c3d88a7f8f5a52157147f1f305  linux-postmarketos-qcom-msm8930-22b00993309e5506552ed6c7b821bbe4d9493b9a.tar.gz
-94331ae8ae6d56f72d34b68b0b5fb229ef0331eb6418ab9b5c918954699993f73faba2c375aa57e5b932b54c8dc62df07c46d5b1dbda61c66629abe235a94123  config-postmarketos-qcom-msm8930.armv7
+8f62add9b223c48df4abb4682dd35756fa1c3a0f55f26ab320b28e3bdacd5e4139e61824e1cf05bb999a335c1b45e3ce634d014a15121d87f62fc66ae6f86005  linux-postmarketos-qcom-msm8930-a5fa8fd179baf5374aa51e9a56a8f212bd9ea331.tar.gz
+066405fb6b466b73eb9bda85733a0074fa005b578c8bde33ee2a3152481e2cee6731fe2caf6006580ff7865a164c236f4c09ce6dcbdc9a2ba42dce8d8dcb6568  config-postmarketos-qcom-msm8930.armv7
 "