mondrianwifi: Remove obsolete dex settings

This block is completely redundant because..
- WITH_DEXPREOPT := true is the default
- WITH_DEXPREOPT_PIC is never read
- DEX_PREOPT_DEFAULT := nostripping has no effect when the
  BOARD_USES_SYSTEM_OTHER_ODEX flag is set to true

Test: make
Change-Id: I618a1e395ca1a14555cd50eef1a4f1aa079b553d

BoardConfig.mk

@@ -84,14 +84,6 @@ BOARD_CHARGING_CMDLINE_NAME := "androidboot.bootchg"
 BOARD_CHARGING_CMDLINE_VALUE := "true"
 WITH_LINEAGE_CHARGER := false
 
-# Dexpreopt
-ifeq ($(HOST_OS),linux)
-  ifneq ($(TARGET_BUILD_VARIANT),eng)
-    WITH_DEXPREOPT_BOOT_IMG_AND_SYSTEM_SERVER_ONLY ?= false
-    WITH_DEXPREOPT := true
-  endif
-endif
-
 # Partitions
 BOARD_FLASH_BLOCK_SIZE := 131072
 BOARD_BOOTIMAGE_PARTITION_SIZE := 10485760