of: of_reserved_mem: Demote kernel-doc abuses

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

 drivers/of/of_reserved_mem.c:53: warning: Function parameter or member 'node' not described in 'fdt_reserved_mem_save_node'
 drivers/of/of_reserved_mem.c:53: warning: Function parameter or member 'uname' not described in 'fdt_reserved_mem_save_node'
 drivers/of/of_reserved_mem.c:53: warning: Function parameter or member 'base' not described in 'fdt_reserved_mem_save_node'
 drivers/of/of_reserved_mem.c:53: warning: Function parameter or member 'size' not described in 'fdt_reserved_mem_save_node'
 drivers/of/of_reserved_mem.c:76: warning: Function parameter or member 'node' not described in '__reserved_mem_alloc_size'
 drivers/of/of_reserved_mem.c:76: warning: Function parameter or member 'uname' not described in '__reserved_mem_alloc_size'
 drivers/of/of_reserved_mem.c:76: warning: Function parameter or member 'res_base' not described in '__reserved_mem_alloc_size'
 drivers/of/of_reserved_mem.c:76: warning: Function parameter or member 'res_size' not described in '__reserved_mem_alloc_size'
 drivers/of/of_reserved_mem.c:171: warning: Function parameter or member 'rmem' not described in '__reserved_mem_init_node'

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Josh Cartwright <joshc@codeaurora.org>
Cc: devicetree@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Signed-off-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210318104036.3175910-11-lee.jones@linaro.org

drivers/of/of_reserved_mem.c

@@ -45,7 +45,7 @@ static int __init early_init_dt_alloc_reserved_memory_arch(phys_addr_t size,
 	return memblock_reserve(base, size);
 }
 
-/**
+/*
  * fdt_reserved_mem_save_node() - save fdt node for second pass initialization
  */
 void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
@@ -67,7 +67,7 @@ void __init fdt_reserved_mem_save_node(unsigned long node, const char *uname,
 	return;
 }
 
-/**
+/*
  * __reserved_mem_alloc_size() - allocate reserved memory described by
  *	'size', 'alignment'  and 'alloc-ranges' properties.
  */
@@ -164,7 +164,7 @@ static int __init __reserved_mem_alloc_size(unsigned long node,
 static const struct of_device_id __rmem_of_table_sentinel
 	__used __section("__reservedmem_of_table_end");
 
-/**
+/*
  * __reserved_mem_init_node() - call region specific reserved memory init code
  */
 static int __init __reserved_mem_init_node(struct reserved_mem *rmem)