s390/dasd: Remove unused structs and function prototypes

There are structs that have never been used. There are also two function
prototypes which were forgotton in commit f9f8d02fae ("[S390] dasd:
revert LCU optimization").

Clean up and keep the header file tidy.

Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>

drivers/s390/block/dasd_eckd.h

@@ -116,35 +116,12 @@ struct ch_t {
 	__u16 head;
 } __attribute__ ((packed));
 
-struct chs_t {
-	__u16 cyl;
-	__u16 head;
-	__u32 sector;
-} __attribute__ ((packed));
-
 struct chr_t {
 	__u16 cyl;
 	__u16 head;
 	__u8 record;
 } __attribute__ ((packed));
 
-struct geom_t {
-	__u16 cyl;
-	__u16 head;
-	__u32 sector;
-} __attribute__ ((packed));
-
-struct eckd_home {
-	__u8 skip_control[14];
-	__u16 cell_number;
-	__u8 physical_addr[3];
-	__u8 flag;
-	struct ch_t track_addr;
-	__u8 reserved;
-	__u8 key_length;
-	__u8 reserved2[2];
-} __attribute__ ((packed));
-
 struct DE_eckd_data {
 	struct {
 		unsigned char perm:2;	/* Permissions on this extent */
@@ -572,7 +549,5 @@ int dasd_alias_remove_device(struct dasd_device *);
 struct dasd_device *dasd_alias_get_start_dev(struct dasd_device *);
 void dasd_alias_handle_summary_unit_check(struct work_struct *);
 void dasd_eckd_reset_ccw_to_base_io(struct dasd_ccw_req *);
-void dasd_alias_lcu_setup_complete(struct dasd_device *);
-void dasd_alias_wait_for_lcu_setup(struct dasd_device *);
 int dasd_alias_update_add_device(struct dasd_device *);
 #endif				/* DASD_ECKD_H */