Add missing Kconfig.ews to fix ARCH not defined error

- Add Kconfig.ews file with SOC_STM32G0B1XX selection
- Add full_name to board.yml (matching nucleo_g0b1re format)
- Copy exact structure from working ST Nucleo board
- This should fix the ARCH not defined error

firmware/canfd_cdc_composite/boards/arm/ews/Kconfig.ews

@@ -0,0 +1,5 @@
+# Copyright (c) 2025 EWS
+# SPDX-License-Identifier: Apache-2.0
+
+config BOARD_EWS
+	select SOC_STM32G0B1XX

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

@@ -1,5 +1,6 @@
 board:
   name: ews
+  full_name: EWS Board
   vendor: others
   socs:
     - name: stm32g0b1xx