FP4: Remove TARGET_ENABLE_MEDIADRM_64

* It's only used when building drm@1.0 HIDL

Change-Id: I06412e2dd2bb48d798be4ef6e9a26a17b65277a7
diff --git a/BoardConfig.mk b/BoardConfig.mk
index c96ae83..acf9506 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -53,9 +53,6 @@
 TARGET_USES_GRALLOC4 := true
 TARGET_USES_HWC2 := true
 
-# DRM
-TARGET_ENABLE_MEDIADRM_64 := true
-
 # Filesystem
 TARGET_FS_CONFIG_GEN := $(DEVICE_PATH)/config.fs