remove persist.sys.usb.config override

The variable persist.sys.usb.config is no longer honored by the framework,
and it's presence causes unnecessary toggling of the USB driver, which
disonnects ADB and makes the device's connection unstable.

Delete it.

Bug: 21404762
Bug: 18905620
Change-Id: Iaeded8a7617e9d787480b91387ca993d4e0a786c
diff --git a/device.mk b/device.mk
index bc57a13..13f3869 100644
--- a/device.mk
+++ b/device.mk
@@ -287,9 +287,6 @@
     device/moto/shamu/nfc/libnfc-brcm.conf:system/etc/libnfc-brcm.conf \
     device/moto/shamu/nfc/libnfc-brcm-20795a10.conf:system/etc/libnfc-brcm-20795a10.conf
 
-PRODUCT_DEFAULT_PROPERTY_OVERRIDES += \
-    persist.sys.usb.config=mtp
-
 # Modem debugger
 ifneq (,$(filter userdebug eng, $(TARGET_BUILD_VARIANT)))
 PRODUCT_PACKAGES += \