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 <[e-mail]>
Reviewed-by: Florian Fainelli <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/pmdomain/bcm/raspberrypi-power.c

···
  */
 struct rpi_power_domain_packet {
 	u32 domain;
-	u32 on;
+	u32 state;
 };
 
 /*
···
 	struct rpi_power_domain_packet packet;
 
 	packet.domain = rpi_domain->domain;
-	packet.on = on;
+	packet.state = on;
 	return rpi_firmware_property(rpi_domain->fw,
 				     rpi_domain->old_interface ?
 				     RPI_FIRMWARE_SET_POWER_STATE :
···
 	int ret;
 
 	packet.domain = RPI_POWER_DOMAIN_ARM;
-	packet.on = ~0;
+	packet.state = ~0;
 
 	ret = rpi_firmware_property(rpi_domains->fw,
 				    RPI_FIRMWARE_GET_DOMAIN_STATE,
 				    &packet, sizeof(packet));
 
-	return ret == 0 && packet.on != ~0;
+	return ret == 0 && packet.state != ~0;
 }
 
 static int rpi_power_probe(struct platform_device *pdev)