coin: drop nanbield testing

Yocto nanbield is EOL, switch its build to scarthgap.
Update release status in README.

Change-Id: I9d99fef1cf0f5d6cc582b200772fe3a458cb41f4
Reviewed-by: Mikko Gronoff <mikko.gronoff@qt.io>

README.md

@@ -23,14 +23,17 @@ the LAYERSERIES_COMPAT (c).
 | Yocto \ Qt | 6.5 | 6.4 | 6.3 | 6.2 |
 | ---------- |:---:|:---:|:---:|:---:|
 | scarthgap  |  x  |     |     |     |
-| nanbield   |  x  |     |     |     |
-| mickledore |  c  |  x  |     |     |
-| langdale   |  c  |  x  |     |     |
-| kirkstone  |  x  |  x  |  x  |  x  |
-| honister   |  c  |  c  |  x  |  x  |
+| nanbield   |  c  |     |     |     |
+| mickledore |  c  |  c  |     |     |
+| langdale   |  c  |  c  |     |     |
+| kirkstone  |  x  |  c  |  c  |  c  |
+| honister   |  c  |  c  |  c  |  c  |
 | hardknott  |  c  |  c  |  c  |  c  |
 | gatesgarth |  c  |  c  |  c  |  c  |
-| dunfell    |  x  |  x  |  x  |  x  |
+| dunfell    |  x  |  c  |  c  |  c  |
+|            |     |     |     |     |
+|            | LTS | EOL | EOL | EOL |
+
 
 Commercial Qt
 -------------

coin/module_config.yaml

@@ -17,7 +17,7 @@ machine_type:
 #
 #           [target1]       [target2]   [target3]       [target4]       [target5]
 # [machine] qemuarm64       qemux86     qemuarm         qemux86-64      qemuarm64
-# [yocto]   nanbield        scarthgap   scarthgap       dunfell         kirkstone
+# [yocto]   scarthgap       scarthgap   scarthgap       dunfell         kirkstone
 # [X11]     no              no          yes             yes             no
 # [mingw]   no              yes         no              no              no
 # [static]  no              no          no              no              yes
@@ -31,7 +31,7 @@ target1: &target1
       variableValue: qemuarm64
     - type: EnvironmentVariable
       variableName: MANIFEST
-      variableValue: nanbield.xml
+      variableValue: scarthgap.xml
     - type: EnvironmentVariable
       variableName: TEST_CONFIGS
       variableValue: ci configs wayland