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/M54418TWR_defconfig b/configs/M54418TWR_defconfig
index 62cebda..19f8983 100644
--- a/configs/M54418TWR_defconfig
+++ b/configs/M54418TWR_defconfig
@@ -2,6 +2,7 @@
 CONFIG_TARGET_M54418TWR=y
 CONFIG_SYS_TEXT_BASE=0x47E00000
 CONFIG_SYS_EXTRA_OPTIONS="CF_SBF,SYS_SERIAL_BOOT,SYS_INPUT_CLKSRC=50000000"
+CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="-> "
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_LOADB is not set