Typedefs starting with `b' in common

• BENCHMARK_REC common/dlgcode.c:212
• BF_TEST common/tests.c:303
• BootEncryptionSetupMode common/apidrvr.h:191
• BootEncryptionSetupRequest common/apidrvr.h:236
• BootEncryptionStatus common/apidrvr.h:227
• byte common/tcdefs.h:43