exynos: Update environment macros a bit

Rework the default environment a bit to not use non-standard
CONFIG_ENV_... names and similar one-off CONFIG names.

Cc: Jaehoon Chung <jh80.chung@samsung.com>
Signed-off-by: Tom Rini <trini@konsulko.com>
Reviewed-by: Jaehoon Chung <jh80.chung@samsung.com>
4 files changed