[media] si476x: Fix some config dependencies and a compile warnings

radio-si476x depends on SND and SND_SOC, the mfd driver should select
REGMAP_I2C.
Also fix a small compile warning in a debug message:
drivers/mfd/si476x-i2c.c: In function ‘si476x_core_drain_rds_fifo’:
drivers/mfd/si476x-i2c.c:391:4: warning: field width specifier ‘*’ expects argument of type ‘int’, but argument 4 has type ‘long unsigned int’ [-Wformat]
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

drivers/media/radio/Kconfig

@@ -20,7 +20,7 @@ source "drivers/media/radio/si470x/Kconfig"
 
 config RADIO_SI476X
 	tristate "Silicon Laboratories Si476x I2C FM Radio"
-	depends on I2C && VIDEO_V4L2
+	depends on I2C && VIDEO_V4L2 && SND && SND_SOC
 	select MFD_CORE
 	select MFD_SI476X_CORE
 	select SND_SOC_SI476X

drivers/mfd/Kconfig

@@ -980,6 +980,7 @@ config MFD_SI476X_CORE
 	tristate "Support for Silicon Laboratories 4761/64/68 AM/FM radio."
 	depends on I2C
 	select MFD_CORE
+	select REGMAP_I2C
 	help
 	  This is the core driver for the SI476x series of AM/FM
 	  radio. This MFD driver connects the radio-si476x V4L2 module

drivers/mfd/si476x-i2c.c

@@ -389,7 +389,7 @@ static void si476x_core_drain_rds_fifo(struct work_struct *work)
 			kfifo_in(&core->rds_fifo, report.rds,
 				 sizeof(report.rds));
 			dev_dbg(&core->client->dev, "RDS data:\n %*ph\n",
-				sizeof(report.rds), report.rds);
+				(int)sizeof(report.rds), report.rds);
 		}
 		dev_dbg(&core->client->dev, "Drrrrained!\n");
 		wake_up_interruptible(&core->rds_read_queue);