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

arch/arm64/include/asm/sysreg.h

@@ -698,6 +698,8 @@
 #define ID_DFR0_PERFMON_8_1		0x4
 #define ID_DFR0_PERFMON_8_4		0x5
 #define ID_DFR0_PERFMON_8_5		0x6
+#define ID_DFR0_PERFMON_8_7		0x7
+#define ID_DFR0_PERFMON_IMP_DEF		0xf
 
 #define ID_ISAR4_SWP_FRAC_SHIFT		28
 #define ID_ISAR4_PSR_M_SHIFT		24