bootz/booti: relocate ramdisk if CONFIG_SYS_BOOT_RAMDISK_HIGH set

In commit c2e7e72b, the ramdisk relocation code was moved from
image_setup_linux to do_bootm, leaving the bootz and booti cases broken.

This patch fixes both by adding the BOOTM_STATE_RAMDISK state in their
call to do_bootm_states if CONFIG_SYS_BOOT_RAMDISK_HIGH is set.

Signed-off-by: Cédric Schieli <cschieli@gmail.com>
Reviewed-by: Rick Altherr <raltherr@google.com>
Tested-by: Masahiro Yamada <yamada.masahiro@socionext.com>