Fix boot_serial size of allocated buffers

This increases the buffer size of the serial bootloader to 256, allowing a
slightly larger mtu and upload speed when doing image upload.

Signed-off-by: Fabio Utzig <utzig@apache.org>
diff --git a/boot/mynewt/src/main.c b/boot/mynewt/src/main.c
index 76280e7..b9f4e83 100755
--- a/boot/mynewt/src/main.c
+++ b/boot/mynewt/src/main.c
@@ -41,11 +41,11 @@
 #include "bootutil/image.h"
 #include "bootutil/bootutil.h"
 
-#define BOOT_AREA_DESC_MAX  (256)
-#define AREA_DESC_MAX       (BOOT_AREA_DESC_MAX)
+#define BOOT_AREA_DESC_MAX    (256)
+#define AREA_DESC_MAX         (BOOT_AREA_DESC_MAX)
 
 #ifdef MCUBOOT_SERIAL
-#define BOOT_SER_CONS_INPUT         128
+#define BOOT_SER_CONS_INPUT   256
 #endif
 
 /*