xfree86: os-support: bsd: a bunch of cleanups
- xfree86: os-support: drop unused CONSOLE_GET_* defines
- xfree86: os-support: move CONSOLE_X_BELL into bsd_bell.c
- xfree86: os-support: move CONSOLE_X_MODE_ON/OFF to bsd_init.c
- xfree86: os-support: move CONSOLE_X_TV_ON/OFF to i386_video.c
- xfree86: os-support: move including machine/sysarch.h out of public header