Pull up following revision(s) (requested by msaitoh in ticket #1338):

usr.sbin/cpuctl/arch/i386.c: revision 1.104
sys/arch/x86/x86/identcpu.c: revision 1.93
sys/arch/x86/include/cacheinfo.h: revision 1.28
sys/arch/x86/include/specialreg.h: revision 1.150

- AMD CPUID Fn8000_0001d Cache Topology Information leaf is almost the same as
  Intel Deterministic Cache Parameter Leaf(0x04), so make new
  cpu_dcp_cacheinfo() and share it.
- AMD's L2 and L3's cache descriptor's definition is the same, so use one
  common definition.
- KNF.

XXX Split some common functions to new identcpu_subr.c or use #ifdef _KERNEK
... #endif in identcpu.c to share from both kernel and cpuctl?

(martin)