vregion: move a header

We want to have the vregion header accessible to userspace builds
like the testbench too. The easiest way to achieve that is by moving
it under src/include/...

Signed-off-by: Guennadi Liakhovetski <guennadi.liakhovetski@linux.intel.com>

Author: lyakh

zephyr/include/sof/lib/vregion.h src/include/sof/lib/vregion.hzephyr/include/sof/lib/vregion.h renamed to src/include/sof/lib/vregion.h

@@ -5,7 +5,6 @@
 #ifndef __SOF_LIB_VREGION_H__
 #define __SOF_LIB_VREGION_H__
 
-#include <zephyr/kernel.h>
 #include <stddef.h>
 
 #ifdef __cplusplus