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/p2571_defconfig b/configs/p2571_defconfig
index f7596a5..73a9f4f 100644
--- a/configs/p2571_defconfig
+++ b/configs/p2571_defconfig
@@ -4,6 +4,7 @@
 CONFIG_TARGET_P2571=y
 CONFIG_DEFAULT_DEVICE_TREE="tegra210-p2571"
 CONFIG_OF_SYSTEM_SETUP=y
+CONFIG_HUSH_PARSER=y
 CONFIG_SYS_PROMPT="Tegra210 (P2571) # "
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set