Add BOOTLOADER_SIZE and remove BOOT_SIZE

- define BOOTLOADER_SIZE in config.h instead of Makefile

keyboard/hhkb/config_iwrap.h

@@ -27,6 +27,16 @@ along with this program.  If not, see <http://www.gnu.org/licenses/>.
 #define DESCRIPTION     t.m.k. keyboard firmware for HHKB mod
 
 
+/* Boot Section Size in *BYTEs*
+ *   Teensy   halfKay    512
+ *   Teensy++ halfKay    1024
+ *   Atmel DFU loader    4096
+ *   LUFA bootloader     4096
+ *   USBaspLoader        2048
+ */
+#define BOOTLOADER_SIZE 2048
+
+
 /* matrix size */
 #define MATRIX_ROWS 8
 #define MATRIX_COLS 8