To expand on @FotL's correct observations: raspberrypi-kernel and friends are the regular kernel + firmware.
Rpi-update is used to get test and development versions for those willing to take the associated risks in order to make early use of new features. Hence the frequent threads saying "don't use rpi-update unless you're sure that's what you want to do." As for kernel updates through apt/apt-get...kernel code gets updated just like any other code and when it's fully vetted as being ready for use, it will be available through the normal upgrade process.
Code: Select all
sudo apt update sudo apt full-upgrade sudo reboot