* CTC's 2018 u-boot is more feature-complete for nx for now. * We may revisit this later. * This remediates issues with RAM carveout, clocks (on erista models), mod chip issues (on mariko models), and brings us almost in-line with L4t releases for nx. Change-Id: I622cc67acb543b6ac54c8ee7a585d88e8066606c