Create missing OBI protocol adapters

[phsauter]

Create protocols adapters from OBI to AXI-Lite, OBI to APB, OBI to register interface and the reverse.
The goal is to make it easier to attach other IPs from PULP and also from outside PULP.

[phsauter]

Existing:

• apb_to_obi.sv (obi repo)
• obi_to_apb.sv (obi repo)
• periph_to_reg.sv (register_interface repo)

Missing:

• axi_lite_to_obi
• obi_to_axi_lite
• axi_to_obi