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/digsy_mtc_defconfig b/configs/digsy_mtc_defconfig
index ce9cbf0..e43a910 100644
--- a/configs/digsy_mtc_defconfig
+++ b/configs/digsy_mtc_defconfig
@@ -2,6 +2,7 @@
 CONFIG_MPC5xxx=y
 CONFIG_TARGET_DIGSY_MTC=y
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_HUSH_PARSER=y
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_PROMPT="autoboot in %d seconds\n"
 CONFIG_AUTOBOOT_DELAY_STR=" "