Software development for PSAS GFE boards

------------- makefile vars to note

GFE_BOARD_NUM
	Defines a variable to register the board serial
	number for this build. See gfe2368-info tree.

LPC23XX_PART
	Defines a part for this build. Some parts require
	special logic. Ex: wrong polarity on D- and D+.

------------- Basic targets

make clean will clean objects from subdirectories.

make allclean will clean objects and all test directories.

make tests will make example tests

------------- SCM: git Submodules

liblpc23xx is a git submodule

Execute:
git submodule init
git submodule update