marlin: change boot image size to 32MB

Boot image size on Marlin/Sailfish should be 32MB.
Modify BoardConfig.mk to align with partition size
and prevent potential over-size problem.

Bug: 31273346
Change-Id: I87b28df1dfd907169c95018a3be675de0f8a6997
diff --git a/marlin/BoardConfig.mk b/marlin/BoardConfig.mk
index 83aa506..008f615 100644
--- a/marlin/BoardConfig.mk
+++ b/marlin/BoardConfig.mk
@@ -81,7 +81,7 @@
 OVERRIDE_RS_DRIVER:= libRSDriver_adreno.so
 
 TARGET_USERIMAGES_USE_EXT4 := true
-BOARD_BOOTIMAGE_PARTITION_SIZE := 0x04000000
+BOARD_BOOTIMAGE_PARTITION_SIZE := 0x02000000
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
 #BOARD_SYSTEMIMAGE_FILE_SYSTEM_TYPE := squashfs
 #BOARD_SYSTEMIMAGE_JOURNAL_SIZE := 0
diff --git a/sailfish/BoardConfig.mk b/sailfish/BoardConfig.mk
index 3d7dc0e..e952bd6 100644
--- a/sailfish/BoardConfig.mk
+++ b/sailfish/BoardConfig.mk
@@ -80,7 +80,7 @@
 OVERRIDE_RS_DRIVER:= libRSDriver_adreno.so
 
 TARGET_USERIMAGES_USE_EXT4 := true
-BOARD_BOOTIMAGE_PARTITION_SIZE := 0x04000000
+BOARD_BOOTIMAGE_PARTITION_SIZE := 0x02000000
 BOARD_SYSTEMIMAGE_PARTITION_SIZE := 2147483648
 BOARD_USERDATAIMAGE_PARTITION_SIZE := 10737418240
 BOARD_PERSISTIMAGE_PARTITION_SIZE := 33554432