Fix build break for target build_test at 5861631

Cause: dummy_x86(_64)/BoardConfig should include this makefile:
       device/generic/common/mgsi/BoardConfigMgsiCommon.mk
instead of the nonexistant .../mgsi/BoardConfigGsiCommon.mk, which
was not included in aosp/1111637, and only exists in my local disk!

Test: # Make sure there's no .../mgsi/BoardConfigGsiCommon.mk, and:
      $ make TARGET_PRODUCT=mgsi_x86 TARGET_BUILD_VARIANT=userdebug
      $ make TARGET_PRODUCT=mgsi_x86_64 TARGET_BUILD_VARIANT=userdebug

Change-Id: I5fadc110e014dbfa71e641d433a4b8cc1189d0d4
diff --git a/dummy_x86/BoardConfig.mk b/dummy_x86/BoardConfig.mk
index d3fc5a2..593088b 100644
--- a/dummy_x86/BoardConfig.mk
+++ b/dummy_x86/BoardConfig.mk
@@ -18,4 +18,4 @@
 TARGET_ARCH_VARIANT := x86
 TARGET_CPU_ABI := x86
 
-include device/generic/common/mgsi/BoardConfigGsiCommon.mk
+include device/generic/common/mgsi/BoardConfigMgsiCommon.mk
diff --git a/dummy_x86_64/BoardConfig.mk b/dummy_x86_64/BoardConfig.mk
index fa29ea4..9e2dfa6 100644
--- a/dummy_x86_64/BoardConfig.mk
+++ b/dummy_x86_64/BoardConfig.mk
@@ -22,4 +22,4 @@
 TARGET_2ND_ARCH_VARIANT := x86_64
 TARGET_2ND_CPU_ABI := x86
 
-include device/generic/common/mgsi/BoardConfigGsiCommon.mk
+include device/generic/common/mgsi/BoardConfigMgsiCommon.mk