rom.sh: new file, to replace script/roms

stub it from the trees script. the way it works now,
there is less code in the build system.

./build roms

this is no longer a thing

./build roms serprog

this is also no longer a thing. instead, do:

./update trees -b coreboot targetnamehere

./update trees -b pico-serprog

./update trees -b stm32-vserprog

the old commands still works, which causes the new
commands to run

coreboot roms now appear in elf/, not bin/, as before,
but those images now contain payloads.

NOTE: to contradict the above: ./build roms is no
longer a thing, in that it's now deprecated, but
backward compatibility is present for now. it will
be removed in a future release.

./build roms list also still works! it will do:
./update trees -b coreboot list

also:
./update trees -b grub list
this is now possible too

if a target "list" is provided, for multi-tree sources,
the targets are shown.

there is another difference: seagrub roms are now seagrub_,
instead of seabios_withgrub.

seabios-only roms are no longer provided, where grub is also
enabled; only seagrub is used. the user can easily remove
the bootorder file, if they want seabios to not try grub first.

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

config/data/coreboot/build.list

@@ -1 +0,0 @@
-build/coreboot.rom

config/data/coreboot/mkhelper.cfg

@@ -1,2 +1,13 @@
 makeargs="UPDATED_SUBMODULES=1 CPUS=$XBMK_THREADS"
 build_depend="seabios/default grub/default memtest86plus"
+
+seavgabiosrom="elf/seabios/default/libgfxinit/vgabios.bin"
+
+pv="payload_uboot payload_seabios payload_memtest payload_grub"
+v="initmode ubootelf grub_scan_disk uboot_config grubtree grubelf pname"
+v="$v displaymode tmprom"
+eval `setvars "n" $pv`
+eval `setvars "" $v`
+
+mkhelper="mkcorebootbin"
+postmake="mkcoreboottar"

config/data/pico-serprog/mkhelper.cfg

@@ -0,0 +1,5 @@
+sersrc="src/pico-serprog"
+serx="$sersrc/build/pico_serprog.uf2"
+picosdk="src/pico-sdk"
+serdir="$picosdk/src/boards/include/boards"
+premake="mkserprog rp2040"

config/data/stm32-vserprog/mkhelper.cfg

@@ -0,0 +1,4 @@
+sersrc="src/stm32-vserprog"
+serx="$sersrc/stm32-vserprog.hex"
+serdir="$sersrc/boards"
+mkhelper="mkserprog stm32"