Enable check_files.py for TF-PSA-Crypto

This commit enables check_files.py to run for Mbed TLS and
TF-PSA-Crypto.

Signed-off-by: Harry Ramsey <harry.ramsey@arm.com>

scripts/check_files.py

@@ -374,7 +374,7 @@ class LicenseIssueTracker(LineIssueTracker):
     if build_tree.is_mbedtls_3_6():
         LICENSE_EXEMPTION_RE_LIST.append(r'3rdparty/(?!(p256-m)/.*)')
     else:
-        LICENSE_EXEMPTION_RE_LIST.append(r'tf-psa-crypto/drivers/(?=(everest)/.*)')
+        LICENSE_EXEMPTION_RE_LIST.append(r'(tf-psa-crypto/)?drivers/(?=(everest)/.*)')
 
     LICENSE_EXEMPTION_RE_LIST += [
         # Documentation explaining the license may have accidental
@@ -479,7 +479,8 @@ class IntegrityChecker:
         """Instantiate the sanity checker.
         Check files under the current directory.
         Write a report of issues to log_file."""
-        build_tree.check_repo_path()
+        if not build_tree.looks_like_root(os.getcwd()):
+            raise Exception("This script must be run from Mbed TLS or TF-PSA-Crypto root")
         self.logger = None
         self.setup_logger(log_file)
         self.issues_to_check = [