ariane_soc: Add APB timer peripheral (#361)

.gitmodules

Bender.yml

Makefile

bootrom/ariane.dts

fpga/src/apb_timer

fpga/src/ariane_peripherals_xilinx.sv

fpga/src/ariane_xilinx.sv

fpga/src/bootrom/ariane.dts

src_files.yml

tb/ariane_peripherals.sv

tb/ariane_soc_pkg.sv

tb/ariane_testharness.sv