Update programmers to enable programming of EMMC device
Detail: Enable insitu programmer to also program to the EMMC if there. Fix error in SDCMOS disc storage address calculation when programming. The Components file suggested &FC000008 whereas the code and programmers used &fc000004. All at &fc000008 now.
Update the u-boot components to use a custom default environment to permit self detection of the boot device. The emmc can be the boot source when there is no sd card in place. Update the HowTo to reflect this.