Exclude serif fonts from system.img

Bug: 72159040
Test: lunch walleye-userdebug && make &&
      grep NotoSerifCJK $ANDROID_PRODUCT_OUT/installed-files.txt
      Then verified NotoSerifCJK is installed.

Test: lunch taimen-userdebug && make &&
      grep NotoSerifCJK $ANDROID_PRODUCT_OUT/installed-files.txt
      Then verified NotoSerifCJK is installed.

Test: lunch marlin-userdebug && make &&
      grep NotoSerifCJK $ANDROID_PRODUCT_OUT/installed-files.txt
      Then verified NotoSerifCJK is not installed.

Test: lunch sailfish-userdebug && make &&
      grep NotoSerifCJK $ANDROID_PRODUCT_OUT/installed-files.txt
      Then verified NotoSerifCJK is not installed.

Change-Id: I9e8ae18f2d5fb8259aa62418471a3a70cf1908ed
diff --git a/marlin/BoardConfig.mk b/marlin/BoardConfig.mk
index 7ee12c1..99c9d71 100644
--- a/marlin/BoardConfig.mk
+++ b/marlin/BoardConfig.mk
@@ -217,3 +217,6 @@
 
 DEVICE_MANIFEST_FILE := device/google/marlin/manifest.xml
 DEVICE_MATRIX_FILE   := device/google/marlin/compatibility_matrix.xml
+
+# Exclude serif fonts for saving system.img size.
+EXCLUDE_SERIF_FONTS := true
diff --git a/sailfish/BoardConfig.mk b/sailfish/BoardConfig.mk
index e2c09db..2b1811e 100644
--- a/sailfish/BoardConfig.mk
+++ b/sailfish/BoardConfig.mk
@@ -202,3 +202,6 @@
 
 DEVICE_MANIFEST_FILE := device/google/marlin/manifest.xml
 DEVICE_MATRIX_FILE   := device/google/marlin/compatibility_matrix.xml
+
+# Exclude serif fonts for saving system.img size.
+EXCLUDE_SERIF_FONTS := true