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

sys/dev/iicbus/iicoc_fdt.c

@@ -185,6 +185,7 @@ static driver_t iicoc_driver = {
 	sizeof(struct iicoc_softc),
 };
 
+SIMPLEBUS_PNP_INFO(compat_data);
 DRIVER_MODULE(iicoc, simplebus, iicoc_driver, iicoc_devclass, 0, 0);
 DRIVER_MODULE(ofw_iicbus, iicoc, ofw_iicbus_driver, ofw_iicbus_devclass, 0, 0);
 MODULE_DEPEND(iicoc, iicbus, 1, 1, 1);

sys/modules/i2c/controllers/Makefile

@@ -5,5 +5,8 @@ SUBDIR = alpm amdpm amdsmb ichiic ichsmb intpm ismt nfsmb viapm lpbb pcf
 .if ${MACHINE_ARCH} == "i386" || ${MACHINE_ARCH} == "amd64"
 SUBDIR += imcsmb
 .endif
+.if ${MACHINE_CPUARCH} == "riscv"
+SUBDIR += iicoc
+.endif
 
 .include <bsd.subdir.mk>

sys/modules/i2c/controllers/iicoc/Makefile

@@ -0,0 +1,7 @@
+.PATH:		${SRCTOP}/sys/dev/iicbus
+
+KMOD		= iicoc
+SRCS		= device_if.h bus_if.h iicbus_if.h \
+		  iicoc.c iicoc_fdt.c iicoc_pci.c
+
+.include <bsd.kmod.mk>