acpi: improve check against acpi_mc_group id and improve error msgs
acpi: improve check against acpi_mc_group id and improve error msgs

Make sure that the group id received from get_acpi_event_group is not 0
before proceeding it further. At the occasion improve some error
messages.

As per review comments:
https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3407321/27
that I didn't make before it was merged.

BUG=None
TEST=Build and boot volteer-manatee

Change-Id: I41a77fc3de10b13905f3f94277d2284acf29e67f
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/crosvm/+/3539980
Reviewed-by: Daniel Verkamp <72bc170b46ec491f7bdd4359a1c0bfed274de40c@chromium.org>
Tested-by: kokoro <2ac7b1f3fa578934c95181d4272be0d3bca00121@google.com>
Commit-Queue: Grzegorz Jaszczyk <c5b88449c8a12e1c1d01de50f0c2b638f2b76073@google.com>

google/crosvm,google/crosvm,google/crosvm,google/crosvm