Oscbs 33 ci zephyr port (#375)

* zephyr: twister build fixes/patches

* zephyr: hack: suppress bvlc test (build failures)

Co-authored-by: Gregory Shue <gregory.shue@legrand.com>

src/bacnet/datalink/cobs.c

@@ -96,9 +96,10 @@ size_t cobs_encode(uint8_t *buffer,
     size_t read_index = 0;
     size_t write_index = 1;
     uint8_t code = 1;
-    uint8_t data, last_code;
+    uint8_t data = 0;
+    uint8_t last_code = 0;
 
-    if (buffer_size < 1) {
+    if ((buffer_size < 1) || (length < 1)) {
         /* error - buffer too small */
         return 0;
     }