iio:adc:twl6030: Enable measurements of VUSB, VBAT and others

iio:adc:twl6030: Enable measurements of VUSB, VBAT and others

commit d135d133c7026a93a18368a1b274e25c9006ea9a upstream.

Some inputs need to be wired up to produce proper measurements,
without this change only near zero values are reported.

Signed-off-by: Andreas Kemnade <andreas@kemnade.info>
Fixes: f3308d41d7f5f ("iio: twl6030-gpadc: TWL6030, TWL6032 GPADC driver")
Link: https://lore.kernel.org/r/20221201181635.3522962-1-andreas@kemnade.info
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>