sensors: cleanup duplicate includes

zephyr.h includes nanokernel.h which includes cpu.h, so make it
simple and just include nanokernel.h. zephyr.h should only be
included in applications.

Change-Id: I11a9ad8608d23af4f2a40a97eb71c09516c3399b
Signed-off-by: Anas Nashif <anas.nashif@intel.com>
1 file changed