mfd: rk808: dt: Add the description about dvs gpio for rk808
mfd: rk808: dt: Add the description about dvs gpio for rk808

add the description about dvs1, dvs2, and add the example.

Signed-off-by: Chris Zhong <83f0f67e3a475ac31423a7deb3ea3845def2c091@rock-chips.com>
Reviewed-by: Doug Anderson <49983c4a76b998672954ed5edf4a62db4a336502@chromium.org>
Signed-off-by: Lee Jones <630e34333487a351a857f6b705e04d30b37c1629@linaro.org>

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