Update gyp file to use src/platform2/common-mk

We are moving the packages built by platform2's ebuild into src/platform2.
We need packages to use src/platform2/common-mk instead of
src/platform/common-mk.

BUG=chromium:378554
TEST=emerge-daisy platform2
TEST=trybot run on daisy, link, mario and duck

CQ-DEPEND=CL:201938

Change-Id: I061143cf6cc510785adf2ec6adb5e254182d2300
Reviewed-on: https://chromium-review.googlesource.com/201957
Tested-by: Bertrand Simonnet <bsimonnet@chromium.org>
Reviewed-by: Ben Chan <benchan@chromium.org>
Commit-Queue: Bertrand Simonnet <bsimonnet@chromium.org>
diff --git a/mist.gyp b/mist.gyp
index 0266037..0e25748 100644
--- a/mist.gyp
+++ b/mist.gyp
@@ -25,7 +25,7 @@
         '<(proto_in_dir)/config.proto',
         '<(proto_in_dir)/usb_modem_info.proto',
       ],
-      'includes': ['../common-mk/protoc.gypi'],
+      'includes': ['../../platform2/common-mk/protoc.gypi'],
     },
     {
       'target_name': 'libmist',
@@ -76,7 +76,7 @@
           'target_name': 'mist_testrunner',
           'type': 'executable',
           'dependencies': ['libmist'],
-          'includes': ['../common-mk/common_test.gypi'],
+          'includes': ['../../platform2/common-mk/common_test.gypi'],
           'sources': [
             'config_loader_unittest.cc',
             'event_dispatcher_unittest.cc',