supermicro x11ssh_f: use underscores in dir names

i don't like hyphens in file names, because of how lbmk
has historically handled directories and files in the past;
i've removed a lot of eval statements, to the extent that
it's no longer likely to be a problem (it's barely used now),
but i previously had a problem with using hyphens in config
names.

this design flaw (in lbmk) was fixed ages ago, but i still
maintain this policy. since that time, i use hyphens only.

Signed-off-by: Leah Rowe <leah@libreboot.org>

config/coreboot/dell3050microsecure_vfsp_16mb/target.cfg

@@ -0,0 +1,14 @@
+# SPDX-License-Identifier: GPL-3.0-or-later
+
+tree="default"
+xarch="i386-elf"
+payload_seabios="y"
+payload_grub="y"
+payload_memtest="y"
+grub_scan_disk="nvme ahci"
+grubtree="xhci_nvme"
+vcfg="3050micro"
+build_depend="seabios/default grub/xhci_nvme memtest86plus u-boot/amd64coreboot"
+IFD_platform="sklkbl"
+payload_uboot="amd64"
+payload_grubsea="y"