cmd: Split 'bootz' and 'booti' out from 'bootm'

The bootz and booti commands rely on common functionality that is found
in common/bootm.c and common/bootm_os.c.  They do not however rely on
the rest of cmd/bootm.c to be implemented so split them into their own
files.  Have various Makefiles include the required infrastructure for
CONFIG_CMD_BOOT[IZ] as well as CONFIG_CMD_BOOTM.  Move the declaration
of 'images' over to common/bootm.c.

Cc: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Tom Rini <trini@konsulko.com>

common/bootm.c

@@ -41,6 +41,8 @@
 
 DECLARE_GLOBAL_DATA_PTR;
 
+bootm_headers_t images;		/* pointers to os/initrd/fdt images */
+
 static const void *boot_get_kernel(cmd_tbl_t *cmdtp, int flag, int argc,
 				   char * const argv[], bootm_headers_t *images,
 				   ulong *os_data, ulong *os_len);