[abi-testsuite] remove use of lit_config.quiet

This config property was removed in
llvm/llvm-project#167192 and now causes failures
when trying to run the test suite. lit_config.note will now
automatically check whether it should emit the diagnostic or not.

Author: hnrklssn

ABI-Testsuite/test/lit.site.cfg

@@ -173,9 +173,8 @@ def determinePlatform():
 # Determine which toolset to use
 tools = determinePlatform()
 generateTests()
-if not lit_config.quiet:
-    lit_config.note("using toolset:")
-    for key, value in tools.items():
-        lit_config.note("\t%s => %s" % (key, value))
+lit_config.note("using toolset:")
+for key, value in tools.items():
+    lit_config.note("\t%s => %s" % (key, value))
 for key, value in tools.items():
     config.substitutions.append((key, value))