uboot-phytec

commands: add more command entries in Kconfig

This commit adds some of command entries (CONFIG_CMD_*) to
cover include/config_cmd_default.h and a little extra.

Because U-Boot supports lots of commands, they should be categorized
according to their usage.

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>