Remove TARGET_ENABLE_MEDIADRM_64 from BoardConfigGsiCommon.mk

The setting doesn't affect system image.

Bug: 239141283
Change-Id: I210add4cd76797bd181923ad8ec439cb96d0ac7c
diff --git a/target/board/BoardConfigGsiCommon.mk b/target/board/BoardConfigGsiCommon.mk
index 53714a8..8c634f6 100644
--- a/target/board/BoardConfigGsiCommon.mk
+++ b/target/board/BoardConfigGsiCommon.mk
@@ -80,6 +80,3 @@
 
 # Setup a vendor image to let PRODUCT_VENDOR_PROPERTIES does not affect GSI
 BOARD_VENDORIMAGE_FILE_SYSTEM_TYPE := ext4
-
-# Disable 64 bit mediadrmserver
-TARGET_ENABLE_MEDIADRM_64 :=