dt-bindings: regulator: qcom: spmi-regulator: Document pm8226 compatible

Suggested-by: Ivaylo Ivanov <ivo.ivanov.ivanov1@gmail.com>
Signed-off-by: Dominik Kobinski <dominikkobinski314@gmail.com>
Link: https://lore.kernel.org/r/20211123180816.2835-1-dominikkobinski314@gmail.comSigned-off-by: Mark Brown <broonie@kernel.org>

Documentation/devicetree/bindings/regulator/qcom,spmi-regulator.txt

@@ -6,6 +6,7 @@ Qualcomm SPMI Regulators
 	Definition: must be one of:
 			"qcom,pm8004-regulators"
 			"qcom,pm8005-regulators"
+			"qcom,pm8226-regulators"
 			"qcom,pm8841-regulators"
 			"qcom,pm8916-regulators"
 			"qcom,pm8941-regulators"