bliss: build: Drop MTK board platforms

 * Remove MTK board platforms, nothing uses this when
   looking for 'MTK_BOARD_PLATFORMS' across the entire
   organization. This lets us revert the utilities back
   to how they were in the QCOM tree.

Change-Id: If3d3a3e7543b79108b26a30c0e02bb3ab154f279
diff --git a/build/core/vendor/mtk_boards.mk b/build/core/vendor/mtk_boards.mk
deleted file mode 100644
index 48fd660..0000000
--- a/build/core/vendor/mtk_boards.mk
+++ /dev/null
@@ -1,5 +0,0 @@
-# Board platforms lists to be used for
-# TARGET_BOARD_PLATFORM specific featurization
-MTK_BOARD_PLATFORMS := mt6592
-MTK_BOARD_PLATFORMS += mt6582
-MTK_BOARD_PLATFORMS += mt6572