Move system default values in system partition

The following properties are specified under platform/build as system
default values.

- tombstoned.max_tombstone_count
- debug.atrace.tags.enableflags
- dalvik.vm.dex2oat-minidebuginfo

So they should move into system partition.

Bug: 64661857
Test: confirmed that the default properties were stored in
/system/etc/prop.default on sailfish device
Change-Id: Ic34c05fd9761e281962b6bb425e4babedfca45a9

target/product/core_minimal.mk

@@ -155,7 +155,7 @@ PRODUCT_COPY_FILES += $(call add-to-product-copy-files-if-exists,\
 
 # On userdebug builds, collect more tombstones by default.
 ifneq (,$(filter userdebug eng,$(TARGET_BUILD_VARIANT)))
-PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
+PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
     tombstoned.max_tombstone_count=50
 endif
 

target/product/embedded.mk

@@ -105,7 +105,7 @@ PRODUCT_PACKAGES_DEBUG += \
 
 # Ensure that this property is always defined so that bionic_systrace.cpp
 # can rely on it being initially set by init.
-PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
+PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
     debug.atrace.tags.enableflags=0
 
 PRODUCT_COPY_FILES += \

target/product/runtime_libart.mk

@@ -89,5 +89,5 @@ PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
     pm.dexopt.shared=speed
 
 # Enable minidebuginfo generation unless overridden.
-PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
+PRODUCT_SYSTEM_DEFAULT_PROPERTIES += \
     dalvik.vm.dex2oat-minidebuginfo=true