build(intel): define a macro for SIMICS build

SIMICS builds have different UART configurations compared
to hardware build. Hence, this patch defines a macro to
differentiate between both.

Signed-off-by: Abdul Halim, Muhammad Hadi Asyrafi <muhammad.hadi.asyrafi.abdul.halim@intel.com>
Signed-off-by: Sieu Mun Tang <sieu.mun.tang@intel.com>
Change-Id: Iadecd5445e06611486ac3c6a214a6d0dc8ccd27b
5 files changed