[MEDIATEK] Force Kernel version value to 5-15

For some of the machines actually supported the bitbake command allowing
to fetch the main kernel version is not working, so we need to force it.

scripts/get_kernel_version.sh

@@ -16,6 +16,9 @@ case "$BOARD" in
     *"tanaro"*)
         kernel_version="5-10"
         ;;
+    *"e58"*)
+        kernel_version="5-15"
+        ;;
 esac
 
 echo "$kernel_version"
\ No newline at end of file