powerpc/ps3: Add macro PS3_VERBOSE_RESULT

To allow more control of the verbosity of ps3_result() add a check
for the preprocessor macro PS3_VERBOSE_RESULT that builds a verbose
verion of the ps3_result() routine.

Signed-off-by: Geoff Levand <geoff@infradead.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
diff --git a/arch/powerpc/include/asm/ps3.h b/arch/powerpc/include/asm/ps3.h
index 0e15db4..678a7c1 100644
--- a/arch/powerpc/include/asm/ps3.h
+++ b/arch/powerpc/include/asm/ps3.h
@@ -245,7 +245,7 @@
 
 static inline const char* ps3_result(int result)
 {
-#if defined(DEBUG)
+#if defined(DEBUG) || defined(PS3_VERBOSE_RESULT)
 	switch (result) {
 	case LV1_SUCCESS:
 		return "LV1_SUCCESS (0)";