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/odroid-c2_defconfig b/configs/odroid-c2_defconfig
index 483d490..808bbc2 100644
--- a/configs/odroid-c2_defconfig
+++ b/configs/odroid-c2_defconfig
@@ -3,6 +3,7 @@
 CONFIG_MESON_GXBB=y
 CONFIG_TARGET_ODROID_C2=y
 CONFIG_DEFAULT_DEVICE_TREE="meson-gxbb-odroidc2"
+CONFIG_HUSH_PARSER=y
 # CONFIG_CMD_BDI is not set
 # CONFIG_CMD_IMI is not set
 # CONFIG_CMD_IMLS is not set