KGDB/KDB fixes and cleanups

 Cleanups
   Clean up compile warnings in kgdboc.c and x86/kernel/kgdb.c
   Add module event hooks for simplified debugging with gdb
 Fixes
   Fix kdb to stop paging with 'q' on bta and dmesg
   Fix for data that scrolls off the vga console due to line wrapping
     when using the kdb pager
 New
   The debug core registers for kernel module events which allows a
     kernel aware gdb to automatically load symbols and break on entry
     to a kernel module
   Allow kgdboc=kdb to setup kdb on the vga console
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