Replace gcc specific/internal keywords with generic ones
Signed-off-by:Anton Bondarenko <anton.bondarenko@arm.com> Approved-by:
Jakub Sujak <jakub.sujak@arm.com>
Signed-off-by:Anton Bondarenko <anton.bondarenko@arm.com> Approved-by:
Jakub Sujak <jakub.sujak@arm.com>