build: fix cmake code generation dependencies.
build: fix cmake code generation dependencies.

There is a race condition between building .bc and header files and
generating code from .cl targets. Fix the race by adding the
dependency to generated files.

Signed-off-by: Ismo Puustinen <75dda586a9213f0e0695eb79120c94222bb30e60@intel.com>

wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet,wdv4758h/beignet