Makefile: removed i2c.o, not used (1.2kB saved)

Makefile

 PLATFORM = lm32
 
-OBJS_WRC = wrc_main.o dev/uart.o dev/endpoint.o dev/minic.o dev/pps_gen.o dev/timer.o dev/softpll.o lib/mprintf.o dev/i2c.o monitor/monitor.o
+OBJS_WRC = wrc_main.o dev/uart.o dev/endpoint.o dev/minic.o dev/pps_gen.o dev/timer.o dev/softpll.o lib/mprintf.o monitor/monitor.o
 
 D = ptp-noposix
 PTPD_CFLAGS  = -ffreestanding -DPTPD_FREESTANDING -DWRPC_EXTRA_SLIM -DPTPD_MSBF -DPTPD_DBG