eth: bnxt: rename ring_err_stats -> ring_drv_stats

eth: bnxt: rename ring_err_stats -> ring_drv_stats

We recently added GRO stats to bnxt, which are maintained
by the driver. Having "err" in the name of the struct for
ring stats no longer makes sense (as pointed out by Michael,
see Link).

Rename them to "drv" stats, as these are all maintained
by the driver (even if partially based on info from descriptors).
Michael suggested calling these misc, happy to go back to
that. IMHO "drv" is a bit more meaningful that "misc".

Pure rename using sed, no functional changes.

Link: https://lore.kernel.org/CACKFLimgibJ0qkM1AacZVh8MKKy-pE_AAc4KPKZ7GUqebmXW9A@mail.gmail.com
Reviewed-by: Michael Chan <michael.chan@broadcom.com>
Link: https://patch.msgid.link/20260223203702.4137801-1-kuba@kernel.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>