arm64: update the value type of macro MPIDR_AFFLVL_MASK

Fix build warning: left shift count >= width of type.
Such as in the case: mpidr & (MPIDR_AFFLVL_MASK << MPIDR_AFF3_SHIFT)

Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>