Remove BIOS and boot loader submodules

As for those without trivial names, EDK II is for UEFI,
and iPXE is a PXE implementation, i.e. a network boot firmware.

Author: McSinyx

.gitmodules

@@ -1,30 +1,12 @@
-[submodule "roms/seabios"]
-	path = roms/seabios
-	url = https://gitlab.com/qemu-project/seabios.git/
 [submodule "roms/SLOF"]
 	path = roms/SLOF
 	url = https://gitlab.com/qemu-project/SLOF.git
-[submodule "roms/ipxe"]
-	path = roms/ipxe
-	url = https://gitlab.com/qemu-project/ipxe.git
-[submodule "roms/openbios"]
-	path = roms/openbios
-	url = https://gitlab.com/qemu-project/openbios.git
 [submodule "roms/qemu-palcode"]
 	path = roms/qemu-palcode
 	url = https://gitlab.com/qemu-project/qemu-palcode.git
-[submodule "roms/sgabios"]
-	path = roms/sgabios
-	url = https://gitlab.com/qemu-project/sgabios.git
 [submodule "dtc"]
 	path = dtc
 	url = https://gitlab.com/qemu-project/dtc.git
-[submodule "roms/u-boot"]
-	path = roms/u-boot
-	url = https://github.com/qemu/u-boot.git
-[submodule "roms/skiboot"]
-	path = roms/skiboot
-	url = https://gitlab.com/qemu-project/skiboot.git
 [submodule "roms/QemuMacDrivers"]
 	path = roms/QemuMacDrivers
 	url = https://gitlab.com/qemu-project/QemuMacDrivers.git
@@ -34,33 +16,15 @@
 [submodule "capstone"]
 	path = capstone
 	url = https://gitlab.com/qemu-project/capstone.git
-[submodule "roms/seabios-hppa"]
-	path = roms/seabios-hppa
-	url = https://gitlab.com/qemu-project/seabios-hppa.git
-[submodule "roms/u-boot-sam460ex"]
-	path = roms/u-boot-sam460ex
-	url = https://github.com/qemu/u-boot-sam460ex.git
 [submodule "tests/fp/berkeley-testfloat-3"]
 	path = tests/fp/berkeley-testfloat-3
 	url = https://gitlab.com/qemu-project/berkeley-testfloat-3.git
 [submodule "tests/fp/berkeley-softfloat-3"]
 	path = tests/fp/berkeley-softfloat-3
 	url = https://gitlab.com/qemu-project/berkeley-softfloat-3.git
-[submodule "roms/edk2"]
-	path = roms/edk2
-	url = https://gitlab.com/qemu-project/edk2.git
 [submodule "slirp"]
 	path = slirp
 	url = https://gitlab.com/qemu-project/libslirp.git
-[submodule "roms/opensbi"]
-	path = roms/opensbi
-	url = 	https://gitlab.com/qemu-project/opensbi.git
-[submodule "roms/qboot"]
-	path = roms/qboot
-	url = https://gitlab.com/qemu-project/qboot.git
 [submodule "meson"]
 	path = meson
 	url = https://gitlab.com/qemu-project/meson.git
-[submodule "roms/vbootrom"]
-	path = roms/vbootrom
-	url = https://gitlab.com/qemu-project/vbootrom.git