Remove west workspace configuration files

- Remove west.yml and .west/config that interfered with existing workspace
- Project should work in existing Zephyr workspace without these files

firmware/.west/config

@@ -1,4 +0,0 @@
-[manifest]
-path = canfd_cdc_composite
-file = west.yml
-

firmware/canfd_cdc_composite/west.yml

@@ -1,16 +0,0 @@
-manifest:
-  defaults:
-    remote: upstream
-
-  remotes:
-    - name: upstream
-      url-base: https://github.com/zephyrproject-rtos
-
-  projects:
-    - name: zephyr
-      remote: upstream
-      revision: main
-      import: true
-
-  self:
-    path: app