Macros starting with `d' in osfmk/mach

• DESCR_SIZE osfmk/mach/rpc.h:201
• DISABLED_OR_DPB_P osfmk/mach/flipc_cb.h:713
• DOE_CONSTRUCT osfmk/mach/flipc_cb.h:714
• DPB_ENDPOINT_RELEASE_OK osfmk/mach/flipc_cb.h:892