x86/cpuid: Switch to 'static const' specifier

This is the only spot where the 'const static' specifier is used;
everywhere else 'static const' is preferred, as static should be the
first specifier.

This is just a cosmetic fix that aligns this, no functional change.

Signed-off-by: Ralf Ramsauer <ralf.ramsauer@oth-regensburg.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Gayatri Kammela <gayatri.kammela@intel.com>
Link: https://lkml.kernel.org/r/20180307160734.6691-1-ralf.ramsauer@oth-regensburg.de