arm: socfpga: Enable build for Arria 10

Update Kconfig and Makefile to enable Arria 10.
Clean up Makefile and sorting *.o alphanumerically.

Signed-off-by: Tien Fong Chee <tien.fong.chee@intel.com>
Signed-off-by: Ley Foon Tan <ley.foon.tan@intel.com>