zipl/src: Add ->set_location() private method of program component

Add/use ->set_location() private method of struct component_footer
instead of checking component types every time when operating with
program components.

Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>

zipl/include/install.h

@@ -58,6 +58,9 @@ struct component_footer {
 			       * in the bootmap file. Otherwise, to
 			       * phy_block_size boundary.
 			       */
+	void (*set_location)(struct component_loc *location,
+			     address_t load_address, blocknum_t count,
+			     int block_size);
 };
 
 struct program_component {
@@ -109,6 +112,12 @@ static inline enum scsi_layout get_scsi_layout(unsigned char *bootblock)
 	return scsi_layout_unknown;
 }
 
+static inline struct component_footer *
+component_footer_by_id(enum program_component_id id)
+{
+	return &component_footers[id];
+}
+
 static inline component_type component_type_by_id(enum program_component_id id)
 {
 	return component_footers[id].type;