ARM: tegra30: implement BCT patching

This function allows updating bootloader from u-boot
on production devices without need in host PC.

Be aware! It works only with re-crypted BCT.

Tested-by: Andreas Westman Dorcsak <hedmoo@yahoo.com> # ASUS TF T30
Tested-by: Svyatoslav Ryhel <clamor95@gmail.com> # LG P895 T30
Signed-off-by: Ramin Khonsari <raminterex@yahoo.com>
Signed-off-by: Svyatoslav Ryhel <clamor95@gmail.com>
Signed-off-by: Tom <twarren@nvidia.com>