x86/resctrl: Fix init const confusion

const variable must be initconst, not initdata.

Signed-off-by: Andi Kleen <andi@firstfloor.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20210425211229.3157674-1-ak@linux.intel.com