ANDROID: arm64: Partial MPAM sysreg definition import

This is a partial cherry-pick of commit:

  7fe77616f156 ("arm64: cpufeature: discover CPU support for MPAM")

from git://git.kernel.org/pub/scm/linux/kernel/git/morse/linux.git



Bug:221768437
Change-Id: Ic33881d8bf4ae803502bf6c789ec1333cb9ca21c
Signed-off-by: Valentin Schneider <Valentin.Schneider@arm.com>