Rewrote ext2/fat fread functions to use fs_fread
Initial commit of nofs, based on an idea by https://github.com/JamesC1
Fixed a bug in emmc.c so that multi block reads now work



git-svn-id: file:///var/johncronin-svn/rpi-boot@97 0f3ef04d-8e58-4d2a-b558-b31704943fbb