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/nyan-big_defconfig b/configs/nyan-big_defconfig
index d86a55c..a14a531 100644
--- a/configs/nyan-big_defconfig
+++ b/configs/nyan-big_defconfig
@@ -7,6 +7,7 @@
 CONFIG_FIT=y
 CONFIG_FIT_BEST_MATCH=y
 CONFIG_OF_SYSTEM_SETUP=y
+CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="Tegra124 (Nyan-big) # "
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set