fastboot: Use const qualifier for char *part_name

In fastboot_*_get_part_info() functions we can use stronger typing by
expecting const strings.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Reviewed-by: Lukasz Majewski <lukma@denx.de>
Reviewed-by: Igor Opaniuk <igor.opaniuk@toradex.com>
4 files changed