linux-postmarketos-qcom-sm6125: Fetch from commit instead of branch

Since GitLab seems to name the folders with the extracted source
[repo]-[branch]-[commit] I've decided it's gonna be easier to just fetch
the commit. I'll probably switch to using tags later instead.

device/testing/linux-postmarketos-qcom-sm6125/APKBUILD

@@ -23,7 +23,7 @@ makedepends="
 
 # Source
 _repository="linux"
-_commit="master"
+_commit="ffe21073175927429b89357ce1fede7eb0d27efe"
 _config="config-$_flavor.$arch"
 source="
 	$pkgname-$_commit.tar.gz::https://gitlab.com/sm6125-mainline/$_repository/-/archive/$_commit.tar.gz
@@ -63,6 +63,6 @@ package() {
 
 
 sha512sums="
-1015de59e6e60619149f9931f9c283954d6fb7ce06ff75f8aaa69c13c934a3e8e504d0f37702c2032d72e6ca871e33416f16447532d2626a6a0ade42b7160819  linux-postmarketos-qcom-sm6125-master.tar.gz
-695be42583078511a180cc2bc36f70a038ff1a3c5e81e084c70ee9341936159ee695884d3e43e5afd6be717ab35e3445ac577c04f4847670040d0c6ab28651fa  config-postmarketos-qcom-sm6125.aarch64
+6727b5e32ffbfa89e79be0ca1e2de24c3129fd56d42f50f8db29d5a8d1c001e36e8f9cd5db655a44047c2ae3d3fb08d0d3da6499063bfb0f2a5c69924adeed21  linux-postmarketos-qcom-sm6125-ffe21073175927429b89357ce1fede7eb0d27efe.tar.gz
+a7bfc6a5323410915df0751e4bbbf67f4c39d2a505de5be18036bd95c958382979504d60590c360a2bdf5d190b9a995e05931da263cd45edc09fea56394e3f0d  config-postmarketos-qcom-sm6125.aarch64
 "