[PATCH] raid6: fix raid6_recov_rvv symbol undeclared warning

[Nam Cao]

Ben Dooks <ben.dooks at codethink.co.uk> writes:
> The riscv recov_rvv.c should have included pq_arch.h for
> the definition of raid6_recov_rvv. Add the include to
> fix the following sparse warning:
>
> lib/raid/raid6/riscv/recov_rvv.c:218:32: warning: symbol 'raid6_recov_rvv' was not declared. Should it be static?
>
> Signed-off-by: Ben Dooks <ben.dooks at codethink.co.uk>

Reviewed-by: Nam Cao <namcao at linutronix.de>