Signed-off-by: Len Brown <len.brown@intel.com>

Added a new OSL interface, acpi_os_get_timer.  This
interface implements a 64-bit monotonic timer in 100
nanosecond units.

Implemented support for the ACPI 3.0 Timer operator.
This 64-bit timer utilizes the timer provided by the
acpi_os_get_timer interface.