Add BCM6878 SOC device tree description to bcmbca binding document.

Signed-off-by: Anand Gore <anand.gore@broadcom.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>

---

Changes in v4:
- Fixed subject line

Changes in v3:
- Simplify subject line

Changes in v2:
- Remove extra empty lines

 Documentation/devicetree/bindings/arm/bcm/brcm,bcmbca.yaml | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/Documentation/devicetree/bindings/arm/bcm/brcm,bcmbca.yaml b/Documentation/devicetree/bindings/arm/bcm/brcm,bcmbca.yaml
index a63e355ba8f9..8b8fc65e8b1b 100644
--- a/Documentation/devicetree/bindings/arm/bcm/brcm,bcmbca.yaml
+++ b/Documentation/devicetree/bindings/arm/bcm/brcm,bcmbca.yaml
@@ -43,6 +43,13 @@ properties:
           - const: brcm,bcmbca
 
 
+      - description: BCM6878 based boards
+        items:
+          - enum:
+              - brcm,bcm96878
+          - const: brcm,bcm6878
+          - const: brcm,bcmbca
+
 additionalProperties: true
 
 ...
-- 
2.25.1