use bool var to control cmdline patching

defaults/main.yml

@@ -36,7 +36,8 @@ homeassistant_open_ports:
 # override /boot/cmdline.txt with new content
 # this can be necessary if you use searial hardware
 # be careful! wrong config can make your system unusable!
-# homeassistant_cmdline_content: "console=tty1 root=/dev/mmcblk0p3 rootfstype=ext4 elevator=deadline rootwait"
+homeassistant_cmdline_override_enabled: False
+homeassistant_cmdline_content: "console=tty1 root=/dev/mmcblk0p3 rootfstype=ext4 elevator=deadline rootwait"
 
 # to prevent ModemManger from binding serial devices like CC2531
 # devices can be skipped by an udev rule

tasks/install.yml

@@ -39,7 +39,7 @@
       copy:
         content: "{{ homeassistant_cmdline_content }}"
         dest: /boot/cmdline.txt
-      when: homeassistant_cmdline_content is defined
+      when: homeassistant_cmdline_override_enabled
 
     - name: Exclude serial devices from ModemManager
       template: