Add initial support for Altera SOCFPGA (heterogeneous ARM/FPGA) SoC family.
Include board configuration for Terasic SoCKit (Altera Cyclone V).

Sponsored by:	DARPA, AFRL


git-svn-id: svn+ssh://svn.freebsd.org/base/head@271093 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f