CI: kernel: enable target testing also for pull request event

Testing target changes was only set for push events. Enable this also
for pull request events to enable testing pr making specific target
changes.

Fixes: 57a02cbbff ("CI: kernel: test each target with additional changes than target/linux")
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

.github/workflows/kernel.yml

@@ -8,7 +8,7 @@ on:
       - '.github/workflows/kernel.yml'
       - 'include/kernel*'
       - 'package/kernel/**'
-      - 'target/linux/generic/**'
+      - 'target/linux/**'
   push:
     paths:
       - '.github/workflows/check-kernel-patches.yml'