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/MPC837XEMDS_defconfig b/configs/MPC837XEMDS_defconfig
index eaee581..99ff225 100644
--- a/configs/MPC837XEMDS_defconfig
+++ b/configs/MPC837XEMDS_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_MPC837XEMDS=y
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_SETEXPR is not set
 CONFIG_SYS_NS16550=y
 CONFIG_OF_LIBFDT=y