UPSTREAM: net: ipa: add a missing __iomem attribute

The virt local variable in gsi_channel_state() does not have an
__iomem attribute but should.  Fix this.

Signed-off-by: Alex Elder <elder@linaro.org>
Reviewed-by: Amy Parker <enbyamy@gmail.com>
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
(cherry picked from commit e6cdd6d8
 https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git

 master)

BUG=b:177097776
TEST=Modem functional, No IPA hang in suspend stress test

Signed-off-by: Sujit Kautkar <sujitka@chromium.org>
Change-Id: I526b125b67ed4875d6291a3f0dc7b2b2b1c5391f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2674472


Reviewed-by: Sean Paul <seanpaul@chromium.org>
Reviewed-by: Evan Green <evgreen@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2685035