Drop Raspberry Pi 1/Zero W support (#1638)

These boards support the rather ancient ARMv6 architecture only. We
officially stopped supporting them already two releases ago, its time to
say goodbye.

.github/workflows/matrix.json

@@ -41,18 +41,6 @@
     "runner": "aarch64-runner",
     "label": "board/odroid"
   },
-  {
-    "id": "rpi",
-    "defconfig": "rpi",
-    "runner": "arm-runner",
-    "label": "board/raspberrypi"
-  },
-  {
-    "id": "rpi0-w",
-    "defconfig": "rpi0_w",
-    "runner": "arm-runner",
-    "label": "board/raspberrypi"
-  },
   {
     "id": "rpi2",
     "defconfig": "rpi2",

.github/workflows/release.yml

@@ -48,8 +48,6 @@ jobs:
           - {"name": "odroid_c4", "output": "odroid-c4", "runner": "aarch64-runner"}
           - {"name": "odroid_n2", "output": "odroid-n2", "runner": "aarch64-runner"}
           - {"name": "odroid_xu4", "output": "odroid-xu4" , "runner": "aarch64-runner"}
-          - {"name": "rpi", "output": "rpi", "runner": "arm-runner"}
-          - {"name": "rpi0_w", "output": "rpi0-w", "runner": "arm-runner"}
           - {"name": "rpi2", "output": "rpi2", "runner": "arm-runner"}
           - {"name": "rpi3", "output": "rpi3", "runner": "arm-runner"}
           - {"name": "rpi3_64", "output": "rpi3-64", "runner": "aarch64-runner"}