mfd: qcom-spmi-pmic: Add support for four variants

Add support for pm8350c, pmk8350, pm7325 and pmr735a PMICS.

Signed-off-by: satya priya <skakit@codeaurora.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Lee Jones <lee.jones@linaro.org>