Raise MTP max burst values.

Slightly increases transfer speeds on USB 3.0 connections.

Test: Transfer files
Change-Id: I25fb0a37fa92063356c4a2a0e0ba7f011b6b0527
diff --git a/media/mtp/MtpFfsHandle.cpp b/media/mtp/MtpFfsHandle.cpp
index 58d2bb8..35dd10f 100644
--- a/media/mtp/MtpFfsHandle.cpp
+++ b/media/mtp/MtpFfsHandle.cpp
@@ -205,13 +205,13 @@
 const struct usb_ss_ep_comp_descriptor ss_sink_comp = {
     .bLength = sizeof(ss_sink_comp),
     .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
-    .bMaxBurst = 2,
+    .bMaxBurst = 6,
 };
 
 const struct usb_ss_ep_comp_descriptor ss_source_comp = {
     .bLength = sizeof(ss_source_comp),
     .bDescriptorType = USB_DT_SS_ENDPOINT_COMP,
-    .bMaxBurst = 2,
+    .bMaxBurst = 6,
 };
 
 const struct usb_ss_ep_comp_descriptor ss_intr_comp = {