release notes: linker & dde_linux
release notes: base-hw scheduler (thanks @m-stein)
release notes: seoul, amt, vbox (thanks @alex-ab)
release notes: review hw scheduling, ldso

@m-stein Do you agree to my changes? What about changing the section
title to "Trading CPU time between components using the HW kernel".
Even though it highlights just one aspect of the scheduler, it is less
technical and may get the reader more engaged.

@ssumpf: Nice section about ldso! Do you agree with my little changes?