Fix board.yml format for Zephyr 4.2.0

- Update board.yml to new Zephyr 4.2 format with 'board:' root key
- Add CONFIG_BOARD_EWS=y to defconfig
- Remove west workspace files (not needed in git)

firmware/.west/config

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

firmware/canfd_cdc_composite/boards/arm/ews/board.yml

@@ -1,10 +1,5 @@
-identifier: ews
-name: EWS Board
-type: mcu
-arch: arm
-family: stm32
-series: stm32g0x
+board:
+  name: ews
+  vendor: ews
   socs:
     - name: stm32g0b1xx
-testing:
-  default: true

firmware/canfd_cdc_composite/boards/arm/ews/ews_defconfig

@@ -1,5 +1,6 @@
 # EWS Board Configuration
 
+CONFIG_BOARD_EWS=y
 CONFIG_SOC_SERIES_STM32G0X=y
 CONFIG_SOC_STM32G0B1XX=y
 

firmware/canfd_cdc_composite/west.yml

@@ -0,0 +1,16 @@
+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