staging: most: dim2: hal: Fix one kernel-doc header and demote two non-conforming ones

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

 drivers/staging/most/dim2/hal.c:99: warning: This comment starts with '/**', but isn't a kernel-doc comment. Refer Documentation/doc-guide/kernel-doc.rst
 drivers/staging/most/dim2/hal.c:788: warning: Function parameter or member 'buf_size' not described in 'dim_norm_isoc_buffer_size'
 drivers/staging/most/dim2/hal.c:788: warning: Function parameter or member 'packet_length' not described in 'dim_norm_isoc_buffer_size'
 drivers/staging/most/dim2/hal.c:788: warning: expecting prototype for Retrieves maximal possible correct buffer size for isochronous data type(). Prototype was for dim_norm_isoc_buffer_size() instead
 drivers/staging/most/dim2/hal.c:802: warning: Function parameter or member 'buf_size' not described in 'dim_norm_sync_buffer_size'
 drivers/staging/most/dim2/hal.c:802: warning: Function parameter or member 'bytes_per_frame' not described in 'dim_norm_sync_buffer_size'
 drivers/staging/most/dim2/hal.c:802: warning: expecting prototype for Retrieves maximal possible correct buffer size for synchronous data type(). Prototype was for dim_norm_sync_buffer_size() instead

Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Andrey Shvetsov <andrey.shvetsov@k2l.de>
Cc: linux-staging@lists.linux.dev
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210414181129.1628598-35-lee.jones@linaro.orgSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/most/dim2/hal.c

@@ -97,7 +97,7 @@ static int dbr_get_mask_size(u16 size)
 
 /**
  * Allocates DBR memory.
- * @param size Allocating memory size.
+ * @size: Allocating memory size.
  * @return Offset in DBR memory by success or DBR_SIZE if out of memory.
  */
 static int alloc_dbr(u16 size)
@@ -778,7 +778,7 @@ void dim_service_mlb_int_irq(void)
 	writel(0, &g.dim2->MS1);
 }
 
-/**
+/*
  * Retrieves maximal possible correct buffer size for isochronous data type
  * conform to given packet length and not bigger than given buffer size.
  *
@@ -792,7 +792,7 @@ u16 dim_norm_isoc_buffer_size(u16 buf_size, u16 packet_length)
 	return norm_isoc_buffer_size(buf_size, packet_length);
 }
 
-/**
+/*
  * Retrieves maximal possible correct buffer size for synchronous data type
  * conform to given bytes per frame and not bigger than given buffer size.
  *