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/P5020DS_SDCARD_defconfig b/configs/P5020DS_SDCARD_defconfig
index fb7bda6..448b489 100644
--- a/configs/P5020DS_SDCARD_defconfig
+++ b/configs/P5020DS_SDCARD_defconfig
@@ -6,6 +6,7 @@
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_SYS_EXTRA_OPTIONS="RAMBOOT_PBL,SDCARD,SYS_TEXT_BASE=0xFFF40000"
+CONFIG_HUSH_PARSER=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SPANSION=y
 CONFIG_NETDEVICES=y