PR 252541: Early kernel panic on RPi4B (Too many early devmatch mappings)

[Klaus Küchemann]

Last but not least , also no problems with default mmccam :
DRAM:  7.9 GiB
RPI 4 Model B (0xd03114):
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>>> Installing kernel GENERIC-MMCCAM completed on Tue Jan 12 02:52:14 UTC 2021
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root at generic:/usr/src # git show-ref --heads
1a816c75600335c4482070df055add6f96885d54 refs/heads/main
root at generic:/usr/src # uname -a
FreeBSD generic 13.0-CURRENT FreeBSD 13.0-CURRENT #15 main-c255871-g1a816c75600: Tue Jan 12 02:27:22 UTC 2021     root at generic:/usr/obj/usr/src/arm64.aarch64/sys/GENERIC-MMCCAM  arm64