core: remove last users of empty FASTCALL macro

FASTCALL is always empty after the x86 removal.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2 files changed