Move CONFIG_SYS_HUSH_PARSER to Kconfig for last 4 boards

I still see some defines of this config in board headers.  Move them
to defconfigs (+ renaming to CONFIG_HUSH_PARSER) to complete this
migration.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/configs/s32v234evb_defconfig b/configs/s32v234evb_defconfig
index 847de63..dfedf82 100644
--- a/configs/s32v234evb_defconfig
+++ b/configs/s32v234evb_defconfig
@@ -2,5 +2,6 @@
 CONFIG_TARGET_S32V234EVB=y
 CONFIG_SYS_MALLOC_F=y
 CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/freescale/s32v234evb/s32v234evb.cfg"
+CONFIG_HUSH_PARSER=y
 CONFIG_CMD_BOOTZ=y
 CONFIG_OF_LIBFDT=y