cmd: Make most commands depend on CMDLINE

If we disable CMDLINE then we should not ask about enabling the hush
parser nor any of the commands that would be run on the command line as
it is no longer available. Convert the CMDLINE option into a menuconfig
and make every command referenced under cmd/Kconfig depend on it.

This leaves as future work moving the commands that are not under the
cmd/ hierarchy as future work.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Tom Rini <trini@konsulko.com>
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Changes in v4:
- Reword the commit message slightly.
- Make this not depend on other patches