dt-bindings: mfd: qcom,spmi-pmic: Drop unused labels from examples

There's not much point in having unused labels in the binding example,
so drop them.

This patch was originally motivated by ea25d61b ("arm64: dts: qcom:
Use plural _gpios node label for PMIC gpios") updating all dts files to
use the plural _gpios label instead of the singular _gpio as label but
this example wasn't updated. But since we should just drop the label
alltogether, do that.

Signed-off-by: Luca Weiss <luca.weiss@fairphone.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231002-pm7250b-gpio-fixup-v2-1-debb8b599989@fairphone.com


Signed-off-by: Lee Jones <lee@kernel.org>