checkpatch: Ignore PREFER_DEFINED_ATTRIBUTE_MACRO

Change-Id: I9c19e49634a6162caea2cfa632a081bbe6336155
Signed-off-by: Amjad Ouled-Ameur <amjad.ouled-ameur@arm.com>
diff --git a/checkpatch/checkpatch.conf b/checkpatch/checkpatch.conf
index 9fe6926..8513afc 100644
--- a/checkpatch/checkpatch.conf
+++ b/checkpatch/checkpatch.conf
@@ -26,6 +26,7 @@
 --ignore MULTILINE_DEREFERENCE
 --ignore PREFER_ALIGNED
 --ignore PREFER_SECTION
+--ignore PREFER_DEFINED_ATTRIBUTE_MACRO
 --show-types
 --typedefsfile TFM_TYPE_DEF_FILE
 --max-line-length=140