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Update lpddr4_timing and blobs from upstream

jacqueline requested to merge jacqueline/reform-boundary-uboot:master into master

These changes ensure that the reform u-boot fork works fine on nitrogen8m_som production runs / revisions that use a slightly different ram chip.

lddr4_timing_8mq.c and ldddr_timing_ch2.h both come from here: https://github.com/boundarydevices/u-boot/blob/boundary-v2020.10/board/boundary/common/

They rely on a couple of new config flags, which I pulled from the result of $ make nitrogen8m_som_4g_defconfig (they helpfully seem to be the same flags for 2g and 4g boards though)

This needs testing on the modules that shipped with the reform production run, but I expect it should be fine.

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