Revert "Remove empty newline in build.prop"

This reverts commit 96a79c6f65335e23870758f857931568a6889be3.

Reason for revert: b/152899887
original cl leads to build.prop getting longer and longer
from 60+ to 1k+ lines and keep increasing

Exempt-From-Owner-Approval:
BUG: 152899887

Change-Id: I83ed1702009278014c77d7e7a7305756041564de
diff --git a/core/Makefile b/core/Makefile
index 03d4b03..e47d423 100644
--- a/core/Makefile
+++ b/core/Makefile
@@ -418,7 +418,7 @@
 $(intermediate_system_build_prop): $(BUILDINFO_SH) $(BUILDINFO_COMMON_SH) $(INTERNAL_BUILD_ID_MAKEFILE) $(BUILD_SYSTEM)/version_defaults.mk $(system_prop_file) $(INSTALLED_ANDROID_INFO_TXT_TARGET) $(API_FINGERPRINT) $(POST_PROCESS_PROPS)
 	@echo Target buildinfo: $@
 	@mkdir -p $(dir $@)
-	$(hide) touch $@
+	$(hide) echo > $@
 ifneq ($(PRODUCT_OEM_PROPERTIES),)
 	$(hide) echo "#" >> $@; \
 	        echo "# PRODUCT_OEM_PROPERTIES" >> $@; \
@@ -517,7 +517,7 @@
 $(INSTALLED_VENDOR_BUILD_PROP_TARGET): $(BUILDINFO_COMMON_SH) $(POST_PROCESS_PROPS) $(intermediate_system_build_prop) $(vendor_prop_files)
 	@echo Target vendor buildinfo: $@
 	@mkdir -p $(dir $@)
-	$(hide) touch $@
+	$(hide) echo > $@
 ifeq ($(PRODUCT_USE_DYNAMIC_PARTITIONS),true)
 	$(hide) echo ro.boot.dynamic_partitions=true >> $@
 endif
@@ -584,7 +584,7 @@
 $(INSTALLED_PRODUCT_BUILD_PROP_TARGET): $(BUILDINFO_COMMON_SH) $(POST_PROCESS_PROPS) $(product_prop_files)
 	@echo Target product buildinfo: $@
 	@mkdir -p $(dir $@)
-	$(hide) touch $@
+	$(hide) echo > $@
 ifdef BOARD_USES_PRODUCTIMAGE
 	$(hide) $(call generate-common-build-props,product,$@)
 endif  # BOARD_USES_PRODUCTIMAGE
@@ -625,7 +625,7 @@
 $(INSTALLED_ODM_BUILD_PROP_TARGET): $(BUILDINFO_COMMON_SH) $(POST_PROCESS_PROPS) $(odm_prop_files)
 	@echo Target odm buildinfo: $@
 	@mkdir -p $(dir $@)
-	$(hide) touch $@
+	$(hide) echo > $@
 	$(hide) echo ro.odm.product.cpu.abilist="$(TARGET_CPU_ABI_LIST)">>$@
 	$(hide) echo ro.odm.product.cpu.abilist32="$(TARGET_CPU_ABI_LIST_32_BIT)">>$@
 	$(hide) echo ro.odm.product.cpu.abilist64="$(TARGET_CPU_ABI_LIST_64_BIT)">>$@
@@ -666,7 +666,7 @@
 $(INSTALLED_SYSTEM_EXT_BUILD_PROP_TARGET): $(BUILDINFO_COMMON_SH) $(POST_PROCESS_PROPS) $(system_ext_prop_files)
 	@echo Target system_ext buildinfo: $@
 	@mkdir -p $(dir $@)
-	$(hide) touch $@
+	$(hide) echo > $@
 	$(hide) $(call generate-common-build-props,system_ext,$@)
 	$(hide) $(foreach file,$(system_ext_prop_files), \
 	    if [ -f "$(file)" ]; then \