linux-postmarketos-qcom-sdm845: update repo URL (MR 2183)

We've rename the kernel repo to
https://gitlab.com/sdm845-mainline/linux,
update the package to point to the new repo.

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

main/linux-postmarketos-qcom-sdm845/APKBUILD

@@ -6,16 +6,16 @@
 _flavor="postmarketos-qcom-sdm845"
 pkgname=linux-$_flavor
 pkgver=5.12
-pkgrel=1
+pkgrel=2
 pkgdesc="Mainline Kernel fork for SDM845 devices"
 arch="aarch64"
 _carch="arm64"
-url="https://gitlab.com/sdm845-mainline/sdm845-linux"
+url="https://gitlab.com/sdm845-mainline/linux"
 license="GPL-2.0-only"
 options="!strip !check !tracedeps pmb:cross-native"
 makedepends="bison findutils flex installkernel openssl-dev perl"
 
-_repo="sdm845-linux"
+_repo="linux"
 _config="config-$_flavor.$arch"
 _commit="b7a1e57f78d690d02aff902114bf2f6ca978ecfe"
 
@@ -52,6 +52,6 @@ package() {
 }
 
 sha512sums="
-befc0ed82a30ee56360951a0983a45d8e09fe616aaf1948794ff8cdd7292bb88045a2a2c16d81251d18c49fb5a38e4cabca5d8caa6981f34b866fac921fb7623  sdm845-linux-b7a1e57f78d690d02aff902114bf2f6ca978ecfe.tar.gz
+e1cb25a9b82ab7ca0f2f54cc0196e683fdb99612475bccaff3527209acdaa45863d12a26a4498f2ce8d0cd63ebdb25f256469d8e5a893e194d44cd41bb8f6170  linux-b7a1e57f78d690d02aff902114bf2f6ca978ecfe.tar.gz
 5bae2fdd558b29854779e503d8fa125d8de03c8da01cbe40207bacde2e5688178bae2840b85b3733a5dab96d256611c594a6abb70274ed7171224080817ef94b  config-postmarketos-qcom-sdm845.aarch64
 "