pmdomain: raspberrypi-power: Adjust packet definition

According to the official Mailbox property interface the second part
of RPI_FIRMWARE_SET_POWER_STATE ( and so on ...) is named state because
it represent u32 flags and just the lowest bit is for on/off. So rename it
to align with documentation and prepare the driver for further changes.

Link: https://github.com/raspberrypi/firmware/wiki/Mailbox-property-interface


Signed-off-by: Stefan Wahren <wahrenst@gmx.net>
Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Link: https://lore.kernel.org/r/20240728114200.75559-4-wahrenst@gmx.net


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>