fix(lts): static checks to point to lts

Changing references in static checks script from origin/master to
origin/lts-v2.8

Signed-off-by: Lauren Wehrmeister <lauren.wehrmeister@arm.com>
Change-Id: Ib954b64df2520e375a2479d7b04ee0a8083f2867
diff --git a/script/static-checks/check-include-order.py b/script/static-checks/check-include-order.py
index 0953507..2232250 100755
--- a/script/static-checks/check-include-order.py
+++ b/script/static-checks/check-include-order.py
@@ -244,7 +244,7 @@
     parser.add_argument(
         "--from-ref",
         help="Base commit in patch mode (default: %(default)s)",
-        default="master",
+        default="lts-v2.8",
     )
     parser.add_argument(
         "--to-ref",