of: base: Fix spelling issue with function param 'prop'

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

 drivers/of/base.c:1781: warning: Function parameter or member 'prop' not described in '__of_add_property'
 drivers/of/base.c:1781: warning: Excess function parameter 'prob' description in '__of_add_property'
 drivers/of/base.c:1804: warning: Function parameter or member 'prop' not described in 'of_add_property'
 drivers/of/base.c:1804: warning: Excess function parameter 'prob' description in 'of_add_property'
 drivers/of/base.c:1855: warning: Function parameter or member 'prop' not described in 'of_remove_property'
 drivers/of/base.c:1855: warning: Excess function parameter 'prob' description in 'of_remove_property'

Cc: Rob Herring <robh+dt@kernel.org>
Cc: Frank Rowand <frowand.list@gmail.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: devicetree@vger.kernel.org
Signed-off-by: Lee Jones <lee.jones@linaro.org>
Link: https://lore.kernel.org/r/20210329152435.900225-1-lee.jones@linaro.orgSigned-off-by: Rob Herring <robh@kernel.org>

drivers/of/base.c

@@ -1775,7 +1775,7 @@ EXPORT_SYMBOL(of_count_phandle_with_args);
 /**
  * __of_add_property - Add a property to a node without lock operations
  * @np:		Caller's Device Node
- * @prob:	Property to add
+ * @prop:	Property to add
  */
 int __of_add_property(struct device_node *np, struct property *prop)
 {
@@ -1798,7 +1798,7 @@ int __of_add_property(struct device_node *np, struct property *prop)
 /**
  * of_add_property - Add a property to a node
  * @np:		Caller's Device Node
- * @prob:	Property to add
+ * @prop:	Property to add
  */
 int of_add_property(struct device_node *np, struct property *prop)
 {
@@ -1844,7 +1844,7 @@ int __of_remove_property(struct device_node *np, struct property *prop)
 /**
  * of_remove_property - Remove a property from a node.
  * @np:		Caller's Device Node
- * @prob:	Property to remove
+ * @prop:	Property to remove
  *
  * Note that we don't actually remove it, since we have given out
  * who-knows-how-many pointers to the data using get-property.