sanitycheck: fix defconfig regex

By convention Kconfigs are in all uppercase, but not strictly
required to be so. Currently the Xtensa build defines
CONFIG_${XTENSA_CORE} which can have lowercase letters. This
is marked for cleanup in ZEP-1711.

Issue: ZEP-1711
Change-Id: Ia901ea1688202129f1629001a77f498522859f14
Signed-off-by: Andrew Boie <[email protected]>

Author: Andrew Boie

scripts/sanitycheck

@@ -1200,7 +1200,7 @@ def defconfig_cb(context, goals, goal):
 
 
 class TestSuite:
-    config_re = re.compile('(CONFIG_[A-Z0-9_]+)[=]\"?([^\"]*)\"?$')
+    config_re = re.compile('(CONFIG_[A-Za-z0-9_]+)[=]\"?([^\"]*)\"?$')
 
     def __init__(self, arch_root, testcase_roots, outdir, coverage):
         # Keep track of which test cases we've filtered out and why