[BUGFIX] wifi: iwlwifi: convert iwl_poll_bits() to a static inline

This reduces overhead and improves performance for callers.

type=bugfix
ticket=none
fixes=Ic7a10a7f8a9a32a9a9feecaf6e3a48fa37479f2d

Signed-off-by: Rotem Kerem <rotem.kerem@intel.com>
Change-Id: I7ea7d08d0487ed68d3c50e5350dae4680a6e68aa
Reviewed-on: https://gerritwcs.ir.intel.com/c/iwlwifi-stack-dev/+/201663
automatic-review: iil_jenkins iil_jenkins <EC.GER.UNIX.IIL.JENKINS@INTEL.COM>
tested: iil_jenkins iil_jenkins <EC.GER.UNIX.IIL.JENKINS@INTEL.COM>
Tested-by: iil_jenkins iil_jenkins <EC.GER.UNIX.IIL.JENKINS@INTEL.COM>
Reviewed-by: Miriam Rachel Korenblit <miriam.rachel.korenblit@intel.com>
x-iwlwifi-stack-dev: 459bf966b5cd710753b9d64d51145cd730f15b46
3 files changed