msm8953-common: 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

BoardConfigCommon.mk

@@ -119,15 +119,6 @@ USE_OPENGL_RENDERER := true
 # DRM
 TARGET_ENABLE_MEDIADRM_64 := true
 
-# Enable dexpreopt to speed boot time
-ifeq ($(HOST_OS),linux)
-    ifneq ($(TARGET_BUILD_VARIANT),eng)
-        ifeq ($(WITH_DEXPREOPT),)
-            WITH_DEXPREOPT := true
-        endif
-    endif
-endif
-
 # FM
 BOARD_HAVE_QCOM_FM := true
 TARGET_QCOM_NO_FM_FIRMWARE := true