Better error message for drop_caches_test

Print out the fault counters with the assertion failure message:

test/vts-testcase/kernel/api/drop_caches_prop/drop_caches_test.cpp:163: Failure
The difference between with_cache_minor_faults and without_cache_major_faults is 20, which exceeds 2, where
with_cache_minor_faults evaluates to 32,
without_cache_major_faults evaluates to 52, and
2 evaluates to 2.
with_cache_major_faults=0 without_cache_minor_faults=0

Bug: 309542726
Change-Id: Ia25b797228d9ec73152a51fff0e68f35082e82b8
1 file changed