rockchip: move pmusram assembler code to a aarch64 subdir

The current code doing power-management from sram is highly
arm64-specific so should live in a corresponding subdirectory
and not in the common area.

Signed-off-by: Heiko Stuebner <heiko@sntech.de>
Change-Id: I3b79ac26f70fd189d4d930faa6251439a644c5d9
4 files changed