[][kernel][mt7988][iio][add rtq6056 current sensor support]

[Description]
Add support for the RTQ6056 current sensor to the mt7988 SoC.
This allows the mt7988 SoC to read the current value measured by the
RTQ6056 ADC through the I2C interface.

[Release-log]
N/A

Change-Id: I8e732a98c5565e2192fbf0195eb3d13c54952d2f
Reviewed-on: https://gerrit.mediatek.inc/c/openwrt/feeds/mtk_openwrt_feeds/+/7567758
3 files changed