These two files needs to be updated due to Linux6.5 device tree has split the generic ARM directory to vendor subdirectories.
Not a big deal to fix them but the board /sys/dts/arm/socfpga_cyclone5_sockit_sdmmc.dts seems to be deprecated
https://www.terasic.com.tw/cgi-bin/page/archive.pl?Language=English&CategoryNo=183&No=816#contents
For the sys/dts/arm/socfpga_arria10_socdk_sdmmc.dts there seems still be supported by Intel.
Why these files are deleted instead of fixed is due to commit 949efdaa1db8cfe165760ebb78efd3e04ad1f758
https://reviews.freebsd.org/D39088