HID: intel-ish: Supply some missing param descriptions

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

 drivers/hid/intel-ish-hid/ishtp/bus.c:173: warning: Function parameter or member 'fw_client' not described in 'ishtp_get_fw_client_id'
 drivers/hid/intel-ish-hid/ishtp/bus.c:845: warning: Function parameter or member 'device' not described in 'ishtp_device'
 drivers/hid/intel-ish-hid/ishtp/bus.c:858: warning: Function parameter or member 'device' not described in 'ishtp_get_pci_device'
 drivers/hid/intel-ish-hid/ishtp/bus.c:871: warning: Function parameter or member 'cl_device' not described in 'ishtp_trace_callback'
 drivers/hid/intel-ish-hid/ishtp/bus.c:884: warning: Function parameter or member 'dev' not described in 'ish_hw_reset'

Cc: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: Jiri Kosina <jikos@kernel.org>
Cc: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Cc: "Uwe Kleine-König" <uwe@kleine-koenig.org>
Cc: linux-input@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>

drivers/hid/intel-ish-hid/ishtp/bus.c

@@ -164,6 +164,7 @@ EXPORT_SYMBOL(ishtp_fw_cl_get_client);
 
 /**
  * ishtp_get_fw_client_id() - Get fw client id
+ * @fw_client:	firmware client used to fetch the ID
  *
  * This interface is used to reset HW get FW client id.
  *
@@ -835,6 +836,7 @@ int ishtp_use_dma_transfer(void)
 
 /**
  * ishtp_device() - Return device pointer
+ * @device: ISH-TP client device instance
  *
  * This interface is used to return device pointer from ishtp_cl_device
  * instance.
@@ -851,6 +853,7 @@ EXPORT_SYMBOL(ishtp_device);
  * ishtp_get_pci_device() - Return PCI device dev pointer
  * This interface is used to return PCI device pointer
  * from ishtp_cl_device instance.
+ * @device: ISH-TP client device instance
  *
  * Return: device *.
  */
@@ -862,6 +865,7 @@ EXPORT_SYMBOL(ishtp_get_pci_device);
 
 /**
  * ishtp_trace_callback() - Return trace callback
+ * @cl_device: ISH-TP client device instance
  *
  * This interface is used to return trace callback function pointer.
  *
@@ -875,6 +879,7 @@ EXPORT_SYMBOL(ishtp_trace_callback);
 
 /**
  * ish_hw_reset() - Call HW reset IPC callback
+ * @dev:	ISHTP device instance
  *
  * This interface is used to reset HW in case of error.
  *