dt-bindings: mfd: qcom,spmi-pmic: Document PMICs bundled with SM8550

Document compatible for the pm8550, pm8550b, pm8550ve, pm8550vs, pmk8550.
pm8010 & pmr735d SPMI PMICs

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20221114-narmstrong-sm8550-upstream-spmi-v2-1-b839bf2d558a@linaro.org