mfd: sprd: Add SC2730 PMIC to SPI device ID table

Add the SC2730 PMIC support for module autoloading
through SPI modalises.

Signed-off-by: Cixi Geng <cixi.geng1@unisoc.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20220425132410.2708304-1-gengcixi@gmail.com