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/T4240QDS_SDCARD_defconfig b/configs/T4240QDS_SDCARD_defconfig
index fa4f1dd..30cbeb9 100644
--- a/configs/T4240QDS_SDCARD_defconfig
+++ b/configs/T4240QDS_SDCARD_defconfig
@@ -7,6 +7,7 @@
 CONFIG_OF_BOARD_SETUP=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
 CONFIG_SYS_EXTRA_OPTIONS="PPC_T4240,RAMBOOT_PBL,SPL_FSL_PBL,SDCARD"
+CONFIG_HUSH_PARSER=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_SST=y
 CONFIG_NETDEVICES=y