Increase the generic_arm64 system image partition size to to 2G.

Bug: 34571380
Test: build sdk_google_phone_arm64.

Change-Id: I53c8980417bfac3651d71c13111a0c1dc0022d6c
(cherry picked from commit 34826908e64146c9d1ce02b0f1e60c0d2528e41d)
diff --git a/target/board/generic_arm64/BoardConfig.mk b/target/board/generic_arm64/BoardConfig.mk
index 34fffed..129021c 100644
--- a/target/board/generic_arm64/BoardConfig.mk
+++ b/target/board/generic_arm64/BoardConfig.mk
@@ -77,7 +77,7 @@
 USE_OPENGL_RENDERER := true
 
 TARGET_USERIMAGES_USE_EXT4 := true
-BOARD_SYSTEMIMAGE_PARTITION_SIZE := 1879048192  # 1.75 GB
+BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648  # 2 GB
 BOARD_USERDATAIMAGE_PARTITION_SIZE := 576716800
 BOARD_CACHEIMAGE_PARTITION_SIZE := 69206016
 BOARD_CACHEIMAGE_FILE_SYSTEM_TYPE := ext4