iio: adc: qcom-spmi-adc5: Fix the channel name

iio: adc: qcom-spmi-adc5: Fix the channel name

The node name can contain an address part which is unused
by the driver. Moreover, this string is propagated into
the userspace label, sysfs filenames *and breaking ABI*.

Cut the address part out before assigning the channel name.

Fixes: 4f47a236a23d ("iio: adc: qcom-spmi-adc5: convert to device properties")
Reported-by: Marijn Suijten <marijn.suijten@somainline.org>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Marijn Suijten <marijn.suijten@somainline.org>
Link: https://lore.kernel.org/r/20230118100623.42255-1-andriy.shevchenko@linux.intel.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>