Remove the kgdb patch because on x86_64 the gcc command includes the -m32

Remove the kgdb patch because on x86_64 the gcc command includes the -m32
flag which tells gcc to define __i386__ and that blows up when asm/kgdb.h
cannot be found.  That exists in asm-i386 but not asm-x86_64.
When/if somebody can figure out why our kernel build is including the
-m32 gcc flag and fixes it we can re-enable the kgdb patch.  This is prob-
ably due to some processor option in the kernel config file.
Is anyone using kgdb with this kernel on this branch anyway?  Maybe devs
in local testing situations?