mfd: si476x-i2c: Fix incorrectly documented function names

Fixes the following W=1 kernel build warning(s):

 drivers/mfd/si476x-i2c.c:360: warning: expecting prototype for si476x_drain_rds_fifo(). Prototype was for si476x_core_drain_rds_fifo() instead
 drivers/mfd/si476x-i2c.c:467: warning: expecting prototype for si476x_get_status(). Prototype was for si476x_core_get_status() instead
 drivers/mfd/si476x-i2c.c:484: warning: expecting prototype for si476x_get_and_signal_status(). Prototype was for si476x_core_get_and_signal_status() instead
 drivers/mfd/si476x-i2c.c:555: warning: expecting prototype for si476x_firmware_version_to_revision(). Prototype was for si476x_core_fwver_to_revision() instead
 drivers/mfd/si476x-i2c.c:619: warning: expecting prototype for si476x_get_revision_info(). Prototype was for si476x_core_get_revision_info() instead

Cc: Lee Jones <lee.jones@linaro.org>
Cc: Andrey Smirnov <andrew.smirnov@gmail.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>

drivers/mfd/si476x-i2c.c

@@ -350,7 +350,7 @@ static inline void si476x_core_start_rds_drainer_once(struct si476x_core *core)
 	mutex_unlock(&core->rds_drainer_status_lock);
 }
 /**
- * si476x_drain_rds_fifo() - RDS buffer drainer.
+ * si476x_core_drain_rds_fifo() - RDS buffer drainer.
  * @work: struct work_struct being ppassed to the function by the
  * kernel.
  *
@@ -454,7 +454,7 @@ int si476x_core_i2c_xfer(struct si476x_core *core,
 EXPORT_SYMBOL_GPL(si476x_core_i2c_xfer);
 
 /**
- * si476x_get_status()
+ * si476x_core_get_status()
  * @core: Core device structure
  *
  * Get the status byte of the core device by berforming one byte I2C
@@ -473,7 +473,7 @@ static int si476x_core_get_status(struct si476x_core *core)
 }
 
 /**
- * si476x_get_and_signal_status() - IRQ dispatcher
+ * si476x_core_get_and_signal_status() - IRQ dispatcher
  * @core: Core device structure
  *
  * Dispatch the arrived interrupt request based on the value of the
@@ -532,7 +532,7 @@ static irqreturn_t si476x_core_interrupt(int irq, void *dev)
 }
 
 /**
- * si476x_firmware_version_to_revision()
+ * si476x_core_fwver_to_revision()
  * @core: Core device structure
  * @func: Selects the boot function of the device:
  *         *_BOOTLOADER  - Boot loader
@@ -603,7 +603,7 @@ static int si476x_core_fwver_to_revision(struct si476x_core *core,
 }
 
 /**
- * si476x_get_revision_info()
+ * si476x_core_get_revision_info()
  * @core: Core device structure
  *
  * Get the firmware version number of the device. It is done in