boards: other: stm32_min_dev: use one twister.yaml

Use twister.yaml  and fix revisions in board.yml.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

boards/others/stm32_min_dev/board.yml

@@ -4,5 +4,9 @@ board:
   vendor: others
   revision:
     format: custom
+    default: "blue"
+    revisions:
+      - name: "blue"
+      - name: "black"
   socs:
     - name: stm32f103xb

boards/others/stm32_min_dev/stm32_min_dev_black.yaml

@@ -1,15 +0,0 @@
-identifier: stm32_min_dev@black
-name: STM32 Minimum Development Board (black)
-type: mcu
-arch: arm
-toolchain:
-  - zephyr
-  - gnuarmemb
-  - xtools
-ram: 20
-supported:
-  - i2c
-  - pwm
-  - spi
-  - adc
-  - gpio

boards/others/stm32_min_dev/twister.yaml

@@ -1,5 +1,3 @@
-identifier: stm32_min_dev@blue
-name: STM32 Minimum Development Board (blue)
 type: mcu
 arch: arm
 toolchain: