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/static-checks-coding-style-line-endings.sh b/script/static-checks/static-checks-coding-style-line-endings.sh
index 77985e0..bb0c4f4 100755
--- a/script/static-checks/static-checks-coding-style-line-endings.sh
+++ b/script/static-checks/static-checks-coding-style-line-endings.sh
@@ -15,7 +15,7 @@
 
 if [[ "$2" == "patch" ]]; then
     cd "$1"
-    parent=$(git merge-base HEAD refs/remotes/origin/master | head -1)
+    parent=$(git merge-base HEAD refs/remotes/origin/lts-v2.8 | head -1)
     git diff ${parent}..HEAD --no-ext-diff --unified=0 --exit-code -a --no-prefix | awk '/^\+/ && /\r$/' &> "$LOG_FILE"
 else
   # For all the source and doc files