irq-forward: use dynamic dev-minor allocation.

Use dynamic allocation for dev minor number to avoid
conflicts with upstream changes.

BUG=None
TEST=build and verify -manatee kernel.

Signed-off-by: Tomasz Jeznach <tjeznach@chromium.org>
Change-Id: I9dce83759b78bc94c8e5cd6fe4c6b6b0c9f6552d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/2846733
Reviewed-by: Micah Morton <mortonm@chromium.org>
Reviewed-by: Daniel Verkamp <dverkamp@chromium.org>
2 files changed