Revert "Chameleon: Filter 4k resolution on Stoney gpu family"
get_gpu_family() should WAI on all boards first.

This reverts commit c49b91662662e5559aba59774052884c0151a4bd.

Reason for revert: <INSERT REASONING HERE>

Original change's description:
> Chameleon: Filter 4k resolution on Stoney gpu family
> 
> AMD's stoney gpu family do not support 4k resolution,
> hence disable executing the same.
> 
> BUG=b:69528863
> TEST=None
> 
> Change-Id: I1411afce113734a5e1e1f2290ab9c22e0497047f
> Signed-off-by: Shirish S <shirish.s@amd.com>
> Reviewed-on: https://chromium-review.googlesource.com/1002432
> Reviewed-by: Daniel Kurtz <djkurtz@chromium.org>
> Reviewed-by: Ilja H. Friedel <ihf@chromium.org>

Bug: b:69528863
Change-Id: I38ace63a58756dbe1aed5002bfeb7f1ec4235547
Reviewed-on: https://chromium-review.googlesource.com/1011829
Tested-by: Kalin Stoyanov <kalin@chromium.org>
Trybot-Ready: Kalin Stoyanov <kalin@chromium.org>
Reviewed-by: Kalin Stoyanov <kalin@chromium.org>
diff --git a/client/cros/chameleon/edid.py b/client/cros/chameleon/edid.py
index c691c03..4260766 100644
--- a/client/cros/chameleon/edid.py
+++ b/client/cros/chameleon/edid.py
@@ -6,7 +6,6 @@
 import operator
 import os
 
-from autotest_lib.client.bin import utils
 
 # TODO: This is a quick workaround; some of our arm devices so far only
 # support the HDMI EDIDs and the DP one at 1680x1050. A more proper
@@ -23,12 +22,11 @@
     """
     # TODO: Support client test that the host is not a CrosHost.
     platform = host.get_platform()
-    gpu_family = utils.get_gpu_family()
     if platform in ('snow', 'spring', 'skate', 'pi', 'jerry'):
         if (width, height) in [(1280, 800), (1440, 900), (1600, 900),
                                (3840, 2160)]:
             return False
-    if gpu_family == 'stoney':
+    if platform in ('kahlee',):
         if (width, height) in [(3840, 2160)]:
             return False
     return True