arch/arm64: allow floating-point registers access

BRANCH=None
BUG=None
TEST=build coreboot, make sure there are fmov instructions
     generated by the compiler, and boot to kernel

Change-Id: Ia99c710be77d5baec7a743a726257ef3ec782635
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: f770a436a0692c8e57a8c80860a180330b71e82c
Original-Change-Id: Iab4ba979b483d19fe92b8a75d9b881a57985eed7
Original-Signed-off-by: Yen Lin <yelin@nvidia.com>
Original-Signed-off-by: Furquan Shaikh <furquan@google.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/262242
Original-Tested-by: Furquan Shaikh <furquan@chromium.org>
Original-Reviewed-by: Aaron Durbin <adurbin@chromium.org>
Original-Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/9884
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
2 files changed