gitignore: add coverage pieces

Add coverage bits to gitignore.

Change-Id: Ia023c7e8d3a0035d72774c90ad76b0895149573f
Signed-off-by: Patrick Venture <venture@google.com>
diff --git a/.gitignore b/.gitignore
index e2fe438..a2b962a 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,3 +1,12 @@
+# Test suite logs
+*.log
+
+# Code Coverage
+*.gcda
+*.gcno
+*.trs
+*-coverage*
+
 *.o
 *.lo
 *.la