hwconfig: Allow to compile it without env support

When env support is disabled then usage of env_get() generates linker
errors. So do not compile env_get() when env support is disabled (for
example when disabled only in SPL).

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Priyanka Jain <priyanka.jain@nxp.com>
1 file changed