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/gdppc440etx_defconfig b/configs/gdppc440etx_defconfig
index 695d860..98a0dcc 100644
--- a/configs/gdppc440etx_defconfig
+++ b/configs/gdppc440etx_defconfig
@@ -2,6 +2,7 @@
 CONFIG_4xx=y
 CONFIG_TARGET_GDPPC440ETX=y
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_HUSH_PARSER=y
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_STOP_STR=" "
 CONFIG_SYS_NS16550=y