mfd: max77686: Use a generic name for the PMIC node in the example
mfd: max77686: Use a generic name for the PMIC node in the example

The ePAPR standard says that: "the name of a node should be somewhat
generic, reflecting the function of the device and not its precise
programming model."

So, change the max77686 binding document example to use a generic
node name instead of using the chip's name.

Suggested-by: Sergei Shtylyov <d8c69075be49b0738b690ec4af0e9025b8c97c9e@cogentembedded.com>
Signed-off-by: Javier Martinez Canillas <828c1a17681e8566a17a1a4801ea67306010b273@osg.samsung.com>
Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs