uboot-sunxi update

Additional update created for the Olimex boards including the A13 Micro, A10s Micro, and A10s Micro with 7 inch LCD (the Fex looks like it should work for the 10 inch LCD as well). 

Update to the PKGBUILD. Additional corresponding fex and env files have been added as necessary for the PKGBUILD requirements. 
MAKEFLAGS in makepkg.conf dictates concurrency, not the PKGBUILD.