arm64: Add ID_DFR0_EL1.PerfMon values for PMUv3p7 and IMP_DEF

Align the ID_DFR0_EL1.PerfMon values with ID_AA64DFR0_EL1.PMUver.

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20221113163832.3154370-2-maz@kernel.org