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/pcm052_defconfig b/configs/pcm052_defconfig
index 49159ce..c47dc01 100644
--- a/configs/pcm052_defconfig
+++ b/configs/pcm052_defconfig
@@ -4,6 +4,7 @@
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="pcm052"
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/phytec/pcm052/imximage.cfg,ENV_IS_IN_NAND"
+CONFIG_HUSH_PARSER=y
 CONFIG_CMD_GPIO=y
 CONFIG_OF_CONTROL=y
 CONFIG_DM=y