cmd: Kconfig: migrate CONFIG_SYS_PROMPT_HUSH_PS2

Move CONFIG_SYS_PROMPT_HUSH_PS2 in Kconfig, depending
on CONFIG_HUSH_PARSER, and remove the default value defined
in cli_hush.c under __U_BOOT__.

Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
Reviewed-by: Simon Glass <sjg@chromium.org>
4 files changed