riscv: dts: allwinner: d1: Add PMU event node

riscv: dts: allwinner: d1: Add PMU event node

D1 has several pmu events supported by opensbi.
These events can be used by perf for profiling.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Link: https://dl.linux-sunxi.org/D1/Xuantie_C906_R1S0_User_Manual.pdf
Link: https://github.com/T-head-Semi/openc906/blob/main/C906_RTL_FACTORY/gen_rtl/pmu/rtl/aq_hpcp_top.v#L657
Reviewed-by: Guo Ren <guoren@kernel.org>
Acked-by: Jernej Skrabec <jernej.skrabec@gmail.com>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/IA1PR20MB49534918FCA69399CE2E0C53BBE0A@IA1PR20MB4953.namprd20.prod.outlook.com
Signed-off-by: Jernej Skrabec <jernej.skrabec@gmail.com>