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/zmx25_defconfig b/configs/zmx25_defconfig
index f853308..955bf37 100644
--- a/configs/zmx25_defconfig
+++ b/configs/zmx25_defconfig
@@ -1,5 +1,6 @@
 CONFIG_ARM=y
 CONFIG_TARGET_ZMX25=y
+CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="zmx25> "
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_PROMPT="boot in %d s\n"