Merge branch 'use-enum-to-represent-the-napi-threaded-state'

Samiullah Khawaja says:

====================
Use enum to represent the NAPI threaded state

Instead of using 0/1 to represent the NAPI threaded states use enum
(disabled/enabled) to represent the NAPI threaded states.

This patch series is a subset of patches from the following patch series:
https://lore.kernel.org/20250718232052.1266188-1-skhawaja@google.com

The first 3 patches are being sent separately as per the feedback to
replace the usage of 0/1 as NAPI threaded states with enum. See:
https://lore.kernel.org/20250721164856.1d2208e4@kernel.org
====================

Link: https://patch.msgid.link/20250723013031.2911384-1-skhawaja@google.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>