Deleted the empty file usb.mk.
Deleted the empty file usb.mk.

sm6xmm/wixel-xDrip,saercnap/wixel-DexDrip,markncooper/burnerlight,StephenBlackWasAlreadyTaken/wixel-xDrip,raduiliescu/wixel-DexDrip,markncooper/burnerlight,saercnap/wixel-DexDrip,kevinwchang/wixel-sdk,StephenBlackWasAlreadyTaken/wixel-xDrip,raduiliescu/wixel-DexDrip,novagannas/wixel-xDrip,sm6xmm/wixel-xDrip,kevinwchang/wixel-sdk,jamorham/wixel-xDrip,sm6xmm/wixel-xDrip,Cagier/wixel-xDrip,StephenBlackWasAlreadyTaken/wixel-xDrip,sm6xmm/wixel-xDrip,jamorham/wixel-xDrip,Cagier/wixel-xDrip,raduiliescu/wixel-DexDrip,pdg137/wixel-sdk,pdg137/wixel-sdk,jamorham/wixel-xDrip,novagannas/wixel-xDrip,kevinwchang/wixel-sdk,markncooper/burnerlight,jamorham/wixel-xDrip,saercnap/wixel-DexDrip,novagannas/wixel-xDrip,Cagier/wixel-xDrip,pdg137/wixel-sdk