configs:stm32mp1: activate env config in SPL

Activate env config in SPL with CONFIG_SPL_ENV_SUPPORT
and use CONFIG_IS_ENABLED macro to test the activated
CONFIG_$(SPL_)ENV_IS_IN_... in env_get_location.

Reviewed-by: Patrice Chotard <patrice.chotard@st.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay@st.com>
2 files changed