configs: Re-sync HUSH options

Move all cases of CONFIG_SYS_HUSH_PARSER out of the config.h files.  Remove
all cases of CONFIG_SYS_PROMPT_HUSH_PS2 as everyone uses the default.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/xpress_defconfig b/configs/xpress_defconfig
index fb2e7b2..418fb7c 100644
--- a/configs/xpress_defconfig
+++ b/configs/xpress_defconfig
@@ -2,6 +2,7 @@
 CONFIG_ARCH_MX6=y
 CONFIG_TARGET_XPRESS=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/ccv/xpress/imximage.cfg"
+CONFIG_HUSH_PARSER=y
 CONFIG_CMD_DHCP=y
 CONFIG_CMD_PING=y
 CONFIG_OF_LIBFDT=y