vregion: remove need to include rtos/alloc.h in !CONFIG_SOF_VREGIONS build

Remove need to include rtos/alloc.h in !CONFIG_SOF_VREGIONS build. We
do not need the dummy vregion objects for anything, so get rid of
them. From now on creating a vregion object when CONFIG_SOF_VREGIONS
is not defined will fail.

Also make sure the vregions is not tried to be used if its not
enabled. Even before this change the failure would have happened
couple of lines later.

Signed-off-by: Jyri Sarha <jyri.sarha@linux.intel.com>

Author: Jyri Sarha

src/audio/module_adapter/module_adapter.c

@@ -92,8 +92,8 @@ static struct processing_module *module_adapter_mem_alloc(const struct comp_driv
 		SOF_MEM_FLAG_USER | SOF_MEM_FLAG_COHERENT : SOF_MEM_FLAG_USER;
 	size_t heap_size;
 
-	if (config->proc_domain == COMP_PROCESSING_DOMAIN_DP && IS_ENABLED(CONFIG_USERSPACE) &&
-	    !IS_ENABLED(CONFIG_SOF_USERSPACE_USE_DRIVER_HEAP)) {
+	if (config->proc_domain == COMP_PROCESSING_DOMAIN_DP && IS_ENABLED(CONFIG_SOF_VREGIONS) &&
+	    IS_ENABLED(CONFIG_USERSPACE) && !IS_ENABLED(CONFIG_SOF_USERSPACE_USE_DRIVER_HEAP)) {
 		mod_vreg = module_adapter_dp_heap_new(config, &heap_size);
 		if (!mod_vreg) {
 			comp_cl_err(drv, "Failed to allocate DP module heap / vregion");

src/include/sof/lib/vregion.h

@@ -125,29 +125,20 @@ void vregion_mem_info(struct vregion *vr, size_t *size, uintptr_t *start);
 
 #else /* CONFIG_SOF_VREGIONS */
 
-#include <rtos/alloc.h>
-
 struct vregion {
 	unsigned int use_count;
 };
 
 static inline struct vregion *vregion_create(size_t lifetime_size, size_t interim_size)
 {
-	struct vregion *vr = rmalloc(0, sizeof(*vr));
-
-	vr->use_count = 1;
-	return vr;
+	return NULL;
 }
 static inline struct vregion *vregion_get(struct vregion *vr)
 {
-	if (vr)
-		vr->use_count++;
 	return vr;
 }
 static inline struct vregion *vregion_put(struct vregion *vr)
 {
-	if (vr && !--vr->use_count)
-		rfree(vr);
 	return vr;
 }
 static inline void *vregion_alloc(struct vregion *vr, enum vregion_mem_type type, size_t size)