platform: generic: allwinner: correct mhpmevent count

Only the CSR mhpmevent 3-9,13-17 of D1 have valid function, so change
the mhpm_mask to a valid value to avoid invalid usage.

Due to the openc906 pmu code
https://github.com/T-head-Semi/openc906/blob/main/C906_RTL_FACTORY/gen_rtl/pmu/rtl/aq_hpcp_top.v



Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>