[$] Android kernel notes from LPC 2020

In its early days, the Android project experienced a high-profiledisconnect with the kernel community. That situation has since improvedconsiderably, but there are stilldifferences between Android kernels and the mainline. As a result, it isnot possible to run Android on a vanilla kernel. That situation continuesto improve, though; much evidence to that effect was on display during theAndroid microconference at the 2020 Linux Plumbers Conference.Several sessions there showed the progress that is being made towardunifying the Android and mainline kernels - and the places where there isstill some work to be done.