dt-bindings: mfd: qcom-spmi-pmic: Add support for PMP8074

Document compatible for the PMP8074 PMIC.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220818221815.346233-1-robimarko@gmail.com