Reduce boot image partition size to 96MB

BoardConfig.mk

@@ -86,7 +86,7 @@ TW_INCLUDE_FASTBOOTD := true
 
 # Partitions
 BOARD_FLASH_BLOCK_SIZE := 262144
-BOARD_BOOTIMAGE_PARTITION_SIZE := 109051904
+BOARD_BOOTIMAGE_PARTITION_SIZE := 100663296
 BOARD_RECOVERYIMAGE_PARTITION_SIZE := 109051904
 
 # Dynamic Partitions