fix: comp_dev: initialize buffer lists to prevent NULL dereference

This patch addresses a NULL dereference issue in the SOF firmware that
was exposed by a recent change in Zephyr's MMU mapping for Intel ADSP
ACE30. The change prevents mapping of the 0x0 address, which helps catch
NULL pointer accesses.

The issue was identified during testing, where an exception occurred due
to uninitialized buffer lists in the `comp_dev` structure. To fix this,
the `bsink_list` and `bsource_list` are now initialized in the
`comp_alloc` function.

This ensures that the lists point to themselves before any use,
preventing NULL dereference and subsequent exceptions.

Signed-off-by: Tomasz Leman <tomasz.m.leman@intel.com>

src/include/sof/audio/component.h

@@ -764,6 +764,8 @@ static inline struct comp_dev *comp_alloc(const struct comp_driver *drv,
 	dev->size = bytes;
 	dev->drv = drv;
 	dev->state = COMP_STATE_INIT;
+	list_init(&dev->bsink_list);
+	list_init(&dev->bsource_list);
 	memcpy_s(&dev->tctx, sizeof(struct tr_ctx),
 		 trace_comp_drv_get_tr_ctx(dev->drv), sizeof(struct tr_ctx));