wil6210: use NAPI_POLL_WEIGHT for napi budget

The comment next to WIL6210_NAPI_BUDGET says "arbitrary".
If we're picking arbitrary values let's pick the recommended
default which is NAPI_POLL_WEIGHT.

Signed-off-by: Jakub Kicinski <kuba@kernel.org>
Signed-off-by: Kalle Valo <quic_kvalo@quicinc.com>
Link: https://lore.kernel.org/r/20220429174643.196994-4-kuba@kernel.org