util: Add cpuinfo-i386.c

Add cpuinfo.h for i386 and x86_64, and the initialization
for that in util/.  Populate that with a slightly altered
copy of the tcg host probing code.  Other uses of cpuid.h
will be adjusted one patch at a time.

Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
diff --git a/MAINTAINERS b/MAINTAINERS
index 6addabd..1a32066 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -157,6 +157,8 @@
 F: include/sysemu/cpus.h
 F: include/sysemu/tcg.h
 F: include/hw/core/tcg-cpu-ops.h
+F: host/include/*/host/cpuinfo.h
+F: util/cpuinfo-*.c
 
 FPU emulation
 M: Aurelien Jarno <aurelien@aurel32.net>