mac80211: rt2x00: backport 'rt2x00: initialize last_reset'

mac80211: rt2x00: backport 'rt2x00: initialize last_reset'

https://patchwork.kernel.org/patch/11161981/
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From: Stanislaw Gruszka <sgruszka@redhat.com>
Subject: [PATCH] rt2x00: initialize last_reset

Initialize last_reset variable to INITIAL_JIFFIES, otherwise it is not
possible to test H/W reset for first 5 minutes of system run.

Fixes: e403fa31ed71 ("rt2x00: add restart hw")
Reported-and-tested-by: Jonathan Liu <net147@gmail.com>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>