SbsaQemu: Initial support for static ACPI tables

- Add the following ACPI tables for SbsaQemu platform
    DSDT, FADT, GTDT, SPCR
- Created an Include directory to hold common header files.
- Also included the Acpiview shell utility.

Co-authored-by: Graeme Gregory <graeme.gregory@linaro.org>
Co-authored-by: Jonathan Cameron <jonathan.cameron@huawei.com>
Signed-off-by: Tanmay Jagdale <tanmay.jagdale@linaro.org>
Reviewed-by: Leif Lindholm <leif@nuviainc.com>