pm: cpupower: bindings: Add test to confirm cpu state is disabled

Add a simple test to confirm and print out the cpu state.

Signed-off-by: "John B. Wyatt IV" <[e-mail]>
Signed-off-by: "John B. Wyatt IV" <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

tools/power/cpupower/bindings/python/test_raw_pylibcpupower.py

···
     case _:
         print(f"Not documented: {cstate_disabled}")
 
+"""
+Test cstate is disabled
+"""
+is_cstate_disabled = p.cpuidle_is_state_disabled(0, 0)
+
+match is_cstate_disabled:
+    case 1:
+        print(f"CPU is disabled")
+    case 0:
+        print(f"CPU is enabled")
+    case -1:
+        print(f"Idlestate not available")
+    case -2:
+        print(f"Disabling is not supported by kernel")
+    case _:
+        print(f"Not documented: {is_cstate_disabled}")
 
 # Pointer example