Merge from CheriBSD:
commit 6d3c4c09226ad6bdd662e3e52489ef294a6ce298
Add terasic_mtl vt(4) framebuffer driver terasic_mtl can be built with syscons(4) and vt(4) attachments, selected at compile time.
commit 33240259b47a7c990a5a88a19f133a5600432a4c
Clear terasic_mtl text buffer on attach
commit d188c2d2412953f949624aa35cd07082830943c9
Update terasic vt(4) driver for FreeBSD r269783
commit d1cc54eee852fa4fc9d359d5bb2171d24ec73369
Safety belt to ensure vt(4) fb parameters are correct
commit 76e6d468ef45711d7952786095fc4791289ebb4b
Improve terasic_mtl_vt fdt parsing - Use OF_getencprop to avoid need for explicit endian handling (submitted by ray@freebsd.org) - Check for expected length and correct pointer type
commit 3e2524b8995ab66e8a9295e4c87cbc7126eeddf4
Correct device_printf usage
commit 9e53e3c8e0766414e25662c95b09cc51c92443b0
Switch framebuffer to match host endianness Xorg and xf86-video-scfb work much better with a native-endian framebuffer.
commit 0f49259d596321ed85288ac0e1fb4ee1c966df48
Switch DE4 to vt(4) and enable kbdmux
commit 5bc96ebc89db7d134ad478335090c8477c1677c7
Add missing \n in device_printf calls
Submitted by: emaste
Sponsored by: DARPA, AFRL