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_RAMBOOT_defconfig b/configs/digsy_mtc_RAMBOOT_defconfig
index ad424dd..4ac8bda 100644
--- a/configs/digsy_mtc_RAMBOOT_defconfig
+++ b/configs/digsy_mtc_RAMBOOT_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_DIGSY_MTC=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_SYS_EXTRA_OPTIONS="SYS_TEXT_BASE=0x00100000"
+CONFIG_HUSH_PARSER=y
 CONFIG_AUTOBOOT_KEYED=y
 CONFIG_AUTOBOOT_PROMPT="Press SPACE to abort autoboot in %d seconds\n"
 CONFIG_AUTOBOOT_DELAY_STR="d"