tools: binman: ti_board_cfg: Check for linting problems

Use yamllint for checking whether YAML configuration files are adhering
to default yamllint rules.

Signed-off-by: Neha Malcom Francis <n-francis@ti.com>
Suggested-by: Nishanth Menon <nm@ti.com>

tools/binman/test/yaml/config.yaml

@@ -10,9 +10,9 @@ main-branch:
     b: 0
   arr: [0, 0, 0, 0]
   another-arr:
-    - #1
+    -  # 1
       c: 0
       d: 0
-    - #2
+    -  # 2
       c: 0
       d: 0