Adds rhino to boards.cfg
Copies configs/am3517_evm.h to configs/rhino.h
Copies board/logicpd/am3517_evm/ to board/uct/rhino/
Copies AM3517 Pin Mux settings from other github repo brandonhamilton/rhino.git
Changes name to MUX_RHINO in board file rhino.c for syntax
Adds configuration for Ethernet MAC, and improves environment