build/roms: add 16mb d510mo config

you must de-solder the default chip and install the new one.
winbond w25q128fvsig is a nice choice of 16MB (128Mbit) IC

resources/coreboot/d510mo_16mb/board.cfg

+cbtree="default"
+romtype="normal"
+arch="x86_64"
+payload_grub="y"
+payload_grub_withseabios="y"
+payload_grub_withtianocore="n"
+payload_seabios="y"
+payload_tianocore="n"
+payload_memtest="y"