KVM: arm64: Get rid or outdated comments

Once apon a time, the 32bit KVM/arm port was the reference, while
the arm64 version was the new kid on the block, without a clear
future... This was a long time ago.

"The times, they are a-changing."

Signed-off-by: Marc Zyngier <maz@kernel.org>

arch/arm64/kvm/sys_regs.c

@@ -34,11 +34,6 @@
 #include "trace.h"
 
 /*
- * All of this file is extremely similar to the ARM coproc.c, but the
- * types are different. My gut feeling is that it should be pretty
- * easy to merge, but that would be an ABI breakage -- again. VFP
- * would also need to be abstracted.
- *
  * For AArch32, we only take care of what is being trapped. Anything
  * that has to do with init and userspace access has to go via the
  * 64bit interface.