CI: trigger check also on build and check-kernel-patches workflow change

Since kernel and packages workflow now use a shared build workflow, they
also need to react on changes on these shared workflow.

Fix this and add these shared workflow to the event paths to check.

Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

.github/workflows/kernel.yml

@@ -3,12 +3,16 @@ name: Build Kernel
 on:
   pull_request:
     paths:
+      - '.github/workflows/check-kernel-patches.yml'
+      - '.github/workflows/build.yml'
       - '.github/workflows/kernel.yml'
       - 'include/kernel*'
       - 'package/kernel/**'
       - 'target/linux/generic/**'
   push:
     paths:
+      - '.github/workflows/check-kernel-patches.yml'
+      - '.github/workflows/build.yml'
       - '.github/workflows/kernel.yml'
       - 'include/kernel*'
       - 'package/kernel/**'