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/igep0030_nand_defconfig b/configs/igep0030_nand_defconfig
index ab65213..b0c4700 100644
--- a/configs/igep0030_nand_defconfig
+++ b/configs/igep0030_nand_defconfig
@@ -3,6 +3,7 @@
 CONFIG_TARGET_OMAP3_IGEP00X0=y
 CONFIG_SPL=y
 CONFIG_SYS_EXTRA_OPTIONS="MACH_TYPE=MACH_TYPE_IGEP0030,BOOT_NAND"
+CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_IMLS is not set
 # CONFIG_CMD_FLASH is not set
 CONFIG_CMD_GPIO=y