x86/cpu/amd: Exclude 32bit only assembler from 64bit build

The "vide" inline assembler is only needed on 32bit kernels for old
32bit only CPUs.

Guard it with an #ifdef so it's not included in 64bit builds.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20190330004743.29541-2-andi@firstfloor.org