Defines starting with `c' in i386/isa/ic

• com_cfcr i386/isa/ic/ns16450.h:46
• com_data i386/isa/ic/ns16450.h:40
• com_dlbh i386/isa/ic/ns16450.h:42
• com_dlbl i386/isa/ic/ns16450.h:41
• com_fifo i386/isa/ic/ns16550.h:45
• com_ier i386/isa/ic/ns16450.h:43
• com_iir i386/isa/ic/ns16450.h:44
• com_lctl i386/isa/ic/ns16450.h:45
• com_lsr i386/isa/ic/ns16450.h:48
• com_mcr i386/isa/ic/ns16450.h:47
• com_msr i386/isa/ic/ns16450.h:49