soong: Add aapt_version_code default

This appends `--version_code=$(date -u +%Y%m%d)` to aapt flags, which is
useful for flushing some caches upon system updates.

Change-Id: I6575b878f09c1c3138e12abc34d39405f51245e7

build/soong/Android.bp

@@ -51,6 +51,26 @@ cc_library_headers {
 }
 
 // Target platform agnostic config modules
+soong_config_module_type {
+    name: "aapt_version_code",
+    module_type: "java_defaults",
+    config_namespace: "lineageGlobalVars",
+    value_variables: ["aapt_version_code"],
+    properties: ["aaptflags"],
+}
+
+aapt_version_code {
+    name: "aapt_version_code_defaults",
+    soong_config_variables: {
+        aapt_version_code: {
+            aaptflags: [
+                "--version-code",
+                "%s",
+            ],
+        },
+    },
+}
+
 soong_config_module_type {
     name: "gralloc_10_usage_bits",
     module_type: "cc_defaults",

config/BoardConfigSoong.mk

@@ -28,6 +28,7 @@ $(foreach v,$(EXPORT_TO_SOONG),$(eval $(call addVar,$(v))))
 
 SOONG_CONFIG_NAMESPACES += lineageGlobalVars
 SOONG_CONFIG_lineageGlobalVars += \
+    aapt_version_code \
     additional_gralloc_10_usage_bits \
     bootloader_message_offset \
     gralloc_handle_has_reserved_size \
@@ -84,6 +85,7 @@ TARGET_TRUST_USB_CONTROL_ENABLE ?= 1
 TARGET_TRUST_USB_CONTROL_DISABLE ?= 0
 
 # Soong value variables
+SOONG_CONFIG_lineageGlobalVars_aapt_version_code := $(shell date -u +%Y%m%d)
 SOONG_CONFIG_lineageGlobalVars_additional_gralloc_10_usage_bits := $(TARGET_ADDITIONAL_GRALLOC_10_USAGE_BITS)
 SOONG_CONFIG_lineageGlobalVars_bootloader_message_offset := $(BOOTLOADER_MESSAGE_OFFSET)
 SOONG_CONFIG_lineageGlobalVars_target_health_charging_control_charging_path := $(TARGET_HEALTH_CHARGING_CONTROL_CHARGING_PATH)