Arm backend: Remove arm_test folder build and test output from git radar

This adds the arm_test folder used as default build and test output
by the arm scripts to .gitignore

Signed-off-by: Zingo Andersen <[email protected]>
Change-Id: Ica94744136167afd904205a30eadf34cc3098ca6

Author: zingo

.gitignore

@@ -8,6 +8,7 @@
 __pycache__/
 
 # Build and tool-generated files
+arm_test/
 buck-out/
 buck2-bin/
 cmake-android-out/