pmdomain: starfive: Extract JH7110 pmu private operations

pmdomain: starfive: Extract JH7110 pmu private operations

Move JH7110 private operation into private data of compatible. Convenient
to add AON PMU which would not have interrupts property.

Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Reviewed-by: Walker Chen <walker.chen@starfivetech.com>
Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20230913-slideshow-luckiness-38ff17de84c6@spud
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>