iicbus: Move opencores i2c driver into controller subdirectory

Sponsored by: Beckhoff Automation GmbH & Co. KG
Differential Revision: https://reviews.freebsd.org/D41914

iicoc: support building as a module

Only build on RISC-V for now, since we're not aware of any other cores
with this IP supported by FreeBSD.

Reviewed by: jrtc27, philip
MFC after: 3 days
Different

iicoc: support building as a module

Only build on RISC-V for now, since we're not aware of any other cores
with this IP supported by FreeBSD.

Reviewed by: jrtc27, philip
MFC after: 3 days
Differential Revision: https://reviews.freebsd.org/D32737

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