perf/hisi: Constify static attribute_group structs

These are only put in an array of pointers to const attribute_group
structs. Make them const like the other static attribute_group structs
to allow the compiler to put them in read-only memory.

Signed-off-by: Rikard Falkeborn <rikard.falkeborn@gmail.com>
Link: https://lore.kernel.org/r/20210605221514.73449-1-rikard.falkeborn@gmail.com


Signed-off-by: Will Deacon <will@kernel.org>