dt-bindings: arm: bcm: fix BCM53012 and BCM53016 SoC strings

Fix inaccurate SoC strings brcm,brcm53012 and brcm,brcm53016 to respectively
brcm,bcm53012 and brcm,bcm53016.

Fixes: 4cb5201fcb5d ("dt-bindings: arm: bcm: Convert BCM4708 to YAML")
Fixes: a2e385f5374d ("dt-bindings: ARM: add bindings for the Meraki MR32")
Signed-off-by: Arınç ÜNAL <[e-mail]>
Reviewed-by: Krzysztof Kozlowski <[e-mail]>
Signed-off-by: Florian Fainelli <[e-mail]>

Documentation/devicetree/bindings/arm/bcm/brcm,bcm4708.yaml

···
               - brcm,bcm953012hr
               - brcm,bcm953012k
               - meraki,mr32
-          - const: brcm,brcm53012
-          - const: brcm,brcm53016
+          - const: brcm,bcm53012
+          - const: brcm,bcm53016
           - const: brcm,bcm4708
 
 additionalProperties: true