c/layer.conf: Pin homescreen revision

Fix observed issue:

```
  homescreen[285]: libc++abi: \
  terminating with uncaught exception of type std::invalid_argument: \
  stol: no conversion

```

To be fixed once linux plugin intergrated and systemd services
adjusted

Relate-to: #3


Signed-off-by: Philippe Coval <philippe.coval.ext@huawei.com>

conf/layer.conf

@@ -27,6 +27,10 @@ LAYERSERIES_COMPAT_meta-oniro-blueprint-flutter = "dunfell honister kirkstone"
 FLUTTER_SDK_TAG ?= "3.0.1"
 # FLUTTER_CHANNEL ?= "stable"
 FLUTTER_RUNTIME ?= "release"
+# TODO: Pin latest version
+SRCREV:pn-ivi-homescreen-release ?= "a8fea1bf3f1d796bcc4d9eb1bad383490728916a"
+SRCREV:pn-ivi-homescreen-debug ?= "a8fea1bf3f1d796bcc4d9eb1bad383490728916a"
+SRCREV:pn-ivi-homescreen-profile ?= "a8fea1bf3f1d796bcc4d9eb1bad383490728916a"
 
 PACKAGECONFIG:pn-flutter-engine-release = "disable-desktop-embeddings embedder-for-target fontconfig release"
 PACKAGECONFIG:pn-flutter-engine-debug = "disable-desktop-embeddings embedder-for-target fontconfig debug"