William Vabrinskas BootLogo 64 bit update

These are all just very minor changes, nothing major to the code at all, mainly to the makefiles. 

The icon still "shrunk" in settings, at least on my device it did, I changed the size to 58 x 58 but I couldn't upload it. 

Thanks again for making this open source and helping the community out! I hope I didn't step on anyone's toes by doing this, sorry if I did.