ACPICA: iASL: Enhance the -tc option (create AML hex file in C)

ACPICA: iASL: Enhance the -tc option (create AML hex file in C)

This change improves the -tc option by:
 1) Creates a unique symbol for the hex table, to simplify
    creation of multiple tables (DSDT/SSDT).
 2) Adds a protection #ifdef, similar to a .h file.

With assistance from:
 Sami Mujawar, sami.mujawar@arm.com
 Evan Lloyd, evan.lloyd@arm.com

Signed-off-by: Bob Moore <robert.moore@intel.com>
Signed-off-by: Erik Schmauss <erik.schmauss@intel.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>