kernel-testing: Fix branch names

Resolves: rhbz#2178800

kernel-testing.yaml

@@ -35,37 +35,37 @@ data:
     rpms:
       python-lit:
         rationale: Lit test runner for LLVM
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 0
       llvm:
         rationale: LLVM tools and libraries
         multilib: [x86_64]
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 0
       compiler-rt:
         rationale: LLVM compiler intrinsic and sanitizer libraries
         multilib: [x86_64]
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 1
       lld:
         rationale: LLVM linker
         multilib: [x86_64]
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 1
       clang:
         rationale: clang tools and libraries 
         multilib: [x86_64]
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 1
       libomp:
         rationale: LLVM OpenMP runtime
         multilib: [x86_64]
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 2
       lldb:
         rationale: lldb debugger
         multilib: [x86_64]
-        ref: stream-rhel-8-rhel-8.9.0
+        ref: stream-llvm-toolset-rhel8-rhel-8.9.0
         buildorder: 2
       kernel:
         ref: rhel-8.9.0