dt-bindings: clock: imx8qxp-lpcg: eliminate yamllint warnings

Eliminate the following yamllint warnings:
./Documentation/devicetree/bindings/clock/imx8qxp-lpcg.yaml
:32:13:[warning] wrong indentation: expected 14 but found 12 (indentation)
:35:9: [warning] wrong indentation: expected 10 but found 8 (indentation)
Signed-off-by: Zhen Lei <thunder.leizhen@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Reviewed-by: Stephen Boyd <sboyd@kernel.org>
Link: https://lore.kernel.org/r/20201207045527.1607-2-thunder.leizhen@huawei.comSigned-off-by: Rob Herring <robh@kernel.org>

Documentation/devicetree/bindings/clock/imx8qxp-lpcg.yaml

@@ -29,18 +29,18 @@ properties:
       - const: fsl,imx8qxp-lpcg
       - items:
           - enum:
-            - fsl,imx8qm-lpcg
+              - fsl,imx8qm-lpcg
           - const: fsl,imx8qxp-lpcg
       - enum:
-        - fsl,imx8qxp-lpcg-adma
-        - fsl,imx8qxp-lpcg-conn
-        - fsl,imx8qxp-lpcg-dc
-        - fsl,imx8qxp-lpcg-dsp
-        - fsl,imx8qxp-lpcg-gpu
-        - fsl,imx8qxp-lpcg-hsio
-        - fsl,imx8qxp-lpcg-img
-        - fsl,imx8qxp-lpcg-lsio
-        - fsl,imx8qxp-lpcg-vpu
+          - fsl,imx8qxp-lpcg-adma
+          - fsl,imx8qxp-lpcg-conn
+          - fsl,imx8qxp-lpcg-dc
+          - fsl,imx8qxp-lpcg-dsp
+          - fsl,imx8qxp-lpcg-gpu
+          - fsl,imx8qxp-lpcg-hsio
+          - fsl,imx8qxp-lpcg-img
+          - fsl,imx8qxp-lpcg-lsio
+          - fsl,imx8qxp-lpcg-vpu
         deprecated: true
   reg:
     maxItems: 1