Fix build error for sdk_gphone_x86_64-userdebug

Increases BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE to 128MB to fix
the build break. This is because we enabled AVB signing in the following
CL. And verified boot metadata will consume the reserved size in current
build system.

  https://android-review.googlesource.com/c/platform/build/+/745691

Bug: None
Test: build sdk_gphone_x86_64-userdebug
Change-Id: If1f44dccbc3a69b1b38a23e979f50c2c52401a25
diff --git a/target/board/BoardConfigGsiCommon.mk b/target/board/BoardConfigGsiCommon.mk
index 7319fec..1df981b 100644
--- a/target/board/BoardConfigGsiCommon.mk
+++ b/target/board/BoardConfigGsiCommon.mk
@@ -10,8 +10,10 @@
 # we explicit specify this need below (even though it's the current default).
 TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
 
-# Enable dyanmic system image size and reserved 64MB in it.
-BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 67108864
+# Enable dynamic system image size and reserved 128MB in it.
+# Currently the reserve size includes verified boot metadata.
+# TODO: adjust to a smaller value if the reserved size is only for file system.
+BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 134217728
 
 # Android Verified Boot (AVB):
 #   1) Sets BOARD_AVB_ENABLE to sign the GSI image.
diff --git a/target/board/treble_common.mk b/target/board/treble_common.mk
index ccb69f2..1869000 100644
--- a/target/board/treble_common.mk
+++ b/target/board/treble_common.mk
@@ -35,8 +35,10 @@
 TARGET_USERIMAGES_USE_F2FS := true
 TARGET_USERIMAGES_SPARSE_EXT_DISABLED := false
 
-# Enable dyanmic system image size and reserved 64MB in it.
-BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 67108864
+# Enable dynamic system image size and reserved 128MB in it.
+# Currently the reserve size includes verified boot metadata.
+# TODO: adjust to a smaller value if the reserved size is only for file system.
+BOARD_SYSTEMIMAGE_PARTITION_RESERVED_SIZE := 134217728
 
 # Generic AOSP image always requires separate vendor.img
 TARGET_COPY_OUT_VENDOR := vendor