Prunes test cases in senstitivity test suite.

This CL reduces the number of 2 GHz channels tested in sensitivity runs.

Test: Done
Bug: None

Change-Id: If562451714fa2a998b93c931ec18ac92de010623
Signed-off-by: Omar El Ayach <oelayach@google.com>
diff --git a/acts/tests/google/wifi/WifiSensitivityTest.py b/acts/tests/google/wifi/WifiSensitivityTest.py
index 00935a8..a31dc66 100644
--- a/acts/tests/google/wifi/WifiSensitivityTest.py
+++ b/acts/tests/google/wifi/WifiSensitivityTest.py
@@ -542,8 +542,13 @@
     def __init__(self, controllers):
         base_test.BaseTestClass.__init__(self, controllers)
         self.tests = self.generate_test_cases(
-            [1, 2, 6, 10, 11, 36, 40, 44, 48, 149, 153, 157, 161],
-            ['0', '1', '2x2'])
+            [6, 36, 40, 44, 48, 149, 153, 157, 161], ['0', '1', '2x2'])
+
+
+class WifiSensitivity_SampleChannels_Test(WifiSensitivityTest):
+    def __init__(self, controllers):
+        base_test.BaseTestClass.__init__(self, controllers)
+        self.tests = self.generate_test_cases([6, 36, 149], ['0', '1', '2x2'])
 
 
 class WifiSensitivity_2GHz_Test(WifiSensitivityTest):