x86/fpu/init: Propagate __init annotations

Now that all the FPU init function call dependencies are
cleaned up we can propagate __init annotations deeper.

This shrinks the runtime size of the kernel a bit, and
also addresses a few section warnings.

Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

arch/x86/kernel/fpu/bugs.c

@@ -60,7 +60,7 @@ static void __init check_fpu(void)
 	}
 }
 
-void fpu__init_check_bugs(void)
+void __init fpu__init_check_bugs(void)
 {
 	/*
 	 * kernel_fpu_begin/end() in check_fpu() relies on the patched