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

Add support for PMP8074 PMIC which is a companion PMIC for the Qualcomm
IPQ8074 SoC-s.

It shares the same subtype identifier as PM8901.

Signed-off-by: Robert Marko <robimarko@gmail.com>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20220818221815.346233-2-robimarko@gmail.com