arm: socfpga: Rename Stratix10 and Agilex handoff common macros

Rename handoff_s10.h to handoff_soc64.h. Changed macros prefix from
S10_HANDOFF to SOC64_HANDOFF.

Signed-off-by: Siew Chin Lim <elly.siew.chin.lim@intel.com>
6 files changed