update-firmware: Make sure we don't try to update with rsi modules alerady loaded

It will not work sine the modprobe does nothing then.
2 jobs for robustify-script in 1 minute and 30 seconds (queued for 1 second)
Status Job ID Name Coverage
  Package
passed #289964
librem5
package:deb-debian-buster

00:00:57

 
  Test Package
passed #289965
librem5
lintian-debian-buster-package

00:00:32