qemu_x86: use icount for 32-bit

Options summary:

 -icount shift=5: Execute one instruction every 32ns of virtual time
 -icount align=off: Do not synchronise the host and guest clocks
 -icount sleep=off: Advance virtual time without sleeping/waiting
 -rtc clock=vm: Isolate the guest RTC time from the host

64-bit still has some issues that are being looked at.

Signed-off-by: Andrew Boie <andrew.p.boie@intel.com>