[7.0][BACKPORT] Fix multi buffer test on gfx950 (#1915)

Fix multi buffer test on gfx950

Author: djramic

mlir/test/Dialect/Rock/integration/multibuffer/lit.local.cfg

@@ -1,2 +1,11 @@
 if (not config.arch_support_mfma):
   config.unsupported = True
+
+# Conditionally skip tests based on architecture
+if hasattr(config, 'arch') and config.arch:
+    if 'gfx950' in config.arch:
+        # For gfx950, skip the regular multibuffer test and run gfx950 specific one
+        config.excludes = ['test_multi_buffer_full.mlir']
+    else:
+        # For other architectures, skip the gfx950 specific test
+        config.excludes = ['test_multi_buffer_full_gfx950.mlir']