misc: mic: scif: scif_dma: Fix a couple of kerneldoc issues

Firstly demote scif_rma_destroy_tcw()'s header to a standard
comment as no attempt has been made to document any of the
function arguments.  Secondly, provide missing description
for 'prot' for scif_register_temp().

Fixes the following W=1 kernel build warnings:

 drivers/misc/mic/scif/scif_dma.c:110: warning: Function parameter or member 'mmn' not described in '__scif_rma_destroy_tcw'
 drivers/misc/mic/scif/scif_dma.c:110: warning: Function parameter or member 'start' not described in '__scif_rma_destroy_tcw'
 drivers/misc/mic/scif/scif_dma.c:110: warning: Function parameter or member 'len' not described in '__scif_rma_destroy_tcw'
 drivers/misc/mic/scif/scif_dma.c:344: warning: Function parameter or member 'prot' not described in 'scif_register_temp'

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/20200701083118.45744-24-lee.jones@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/misc/mic/scif/scif_dma.c

@@ -99,7 +99,7 @@ int scif_reserve_dma_chan(struct scif_endpt *ep)
 }
 
 #ifdef CONFIG_MMU_NOTIFIER
-/**
+/*
  * scif_rma_destroy_tcw:
  *
  * This routine destroys temporary cached windows
@@ -332,6 +332,7 @@ static bool scif_rma_tc_can_cache(struct scif_endpt *ep, size_t cur_bytes)
  * @epd: End Point Descriptor.
  * @addr: virtual address to/from which to copy
  * @len: length of range to copy
+ * @prot: read/write protection
  * @out_offset: computed offset returned by reference.
  * @out_window: allocated registered window returned by reference.
  *