Remove all init functions that do nothing, and provide a `NULL` to
*DEVICE*DEFINE* macros.
Signed-off-by: Gerard Marull-Paretas <gerard.marull@nordicsemi.no>
It should never be intended to return an uninitialized
variable from a function.
Remove the use of the uninitialized variable to fix the bug.
Signed-off-by: Chao Song <chao.song@linux.intel.com>
Support multiple DTS instances in the C code, also
just initialize devices that are not disabled.
Signed-off-by: Flavio Ceolin <flavio.ceolin@intel.com>
