misc: mic: host: mic_x100: Add missing descriptions to kerneldoc headers

Fixes the following W=1 warnings:

 drivers/misc/mic/host/mic_x100.c:127: warning: Function parameter or member 'doorbell' not described in 'mic_x100_send_sbox_intr'
 drivers/misc/mic/host/mic_x100.c:148: warning: Function parameter or member 'doorbell' not described in 'mic_x100_send_rdmasr_intr'
 drivers/misc/mic/host/mic_x100.c:511: warning: Function parameter or member 'dma_addr' not described in 'mic_x100_smpt_set'
 drivers/misc/mic/host/mic_x100.c:511: warning: Function parameter or member 'index' not described in 'mic_x100_smpt_set'

Cc: Sudeep Dutt <sudeep.dutt@intel.com>
Cc: Ashutosh Dixit <ashutosh.dixit@intel.com>
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20200701083118.45744-13-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mic/host/mic_x100.c

@@ -121,6 +121,7 @@ static void mic_x100_disable_interrupts(struct mic_device *mdev)
 /**
  * mic_x100_send_sbox_intr - Send an MIC_X100_SBOX interrupt to MIC.
  * @mdev: pointer to mic_device instance
+ * @doorbell: doorbell number
  */
 static void mic_x100_send_sbox_intr(struct mic_device *mdev,
 				    int doorbell)
@@ -142,6 +143,7 @@ static void mic_x100_send_sbox_intr(struct mic_device *mdev,
 /**
  * mic_x100_send_rdmasr_intr - Send an RDMASR interrupt to MIC.
  * @mdev: pointer to mic_device instance
+ * @doorbell: doorbell number
  */
 static void mic_x100_send_rdmasr_intr(struct mic_device *mdev,
 				      int doorbell)
@@ -503,6 +505,8 @@ static u32 mic_x100_get_postcode(struct mic_device *mdev)
 /**
  * mic_x100_smpt_set - Update an SMPT entry with a DMA address.
  * @mdev: pointer to mic_device instance
+ * @dma_addr: DMA address to use
+ * @index: entry to write to
  *
  * RETURNS: none.
  */