[S] Change in coreboot[main]: Update opensbi submodule to upstream master branch

[ron minnich (Code Review)]

Attention is currently required from: Martin L Roth, Maximilian Brune, Philipp Hug.

ron minnich has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/81543?usp=email )

Change subject: Update opensbi submodule to upstream master branch
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Patch Set 4:

(1 comment)

Patchset:

PS4: 
it's hanging at this
589		/*
590		 * Do platform specific nascent (very early) initialization so
591		 * that platform can initialize platform specific per-HART CSRs
592		 * or per-HART devices.
593		 */
594		if (sbi_platform_nascent_init(plat))
(gdb)
595			sbi_hart_hang();

This opensbi code makes me scream.