of: unittest: print pass messages at PR_INFO level

Printing the devicetree unittest pass message for each passed test
creates much console verbosity. The existing pass messages are
printed at loglevel KERN_DEBUG so they will not print by default.

Change default to print the pass messages at loglevel PR_INFO so
they will print with the default console loglevel.

The test community expects either a pass or a fail message for each
test in a test suite. The messages are typically post-processed to
report pass/fail results.

Signed-off-by: Frank Rowand <[e-mail]>
Tested-by: Linux Kernel Functional Testing <[e-mail]>
Signed-off-by: Rob Herring <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]

drivers/of/unittest.c

···
 		pr_err("FAIL %s():%i " fmt, __func__, __LINE__, ##__VA_ARGS__); \
 	} else { \
 		unittest_results.passed++; \
-		pr_debug("pass %s():%i\n", __func__, __LINE__); \
+		pr_info("pass %s():%i\n", __func__, __LINE__); \
 	} \
 	failed; \
 })