graphics/drm-510-kmod: fix runtime on powerpc64*

Add a patch from https://github.com/freebsd/drm-kmod/issues/214 to failure to load:
Mar 16 10:29:34 talos kernel: link_elf: symbol acpi_iicbus_driver undefined
Mar 16 10:29:35 talos kernel: KLD radeonkms.ko: depends on drmn - not available or version mismatch

evadot mentioned that it had been fixed, but the issue still happens on FreeBSD
13.2-RC2 with drm-510-kmod-5.10.163_2.