Add base files for Acer Chromebook 515 Plus (CB515-2H) / Google Omnigul.

Board configuration from: nitropad-nv41.
Linux configuration from: linux-nitropad-x.config
Coreboot configuration from: MrChromeBox EDK2 configuration for omnigul.

Signed-off-by: Matthew Drobnak <matthew@drobnak.com>

boards/omnigul/omnigul.config

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+# Nitrokey Nitropad NV41 board configuration
+# Note: for reference, other GOP enabled FB board is librem_11
+
+export CONFIG_COREBOOT=y
+export CONFIG_COREBOOT_VERSION=dasharo
+export CONFIG_LINUX_VERSION=6.1.8
+
+CONFIG_COREBOOT_CONFIG=config/coreboot-omnigul.config
+CONFIG_LINUX_CONFIG=config/linux-omnigul.config
+
+#Enable DEBUG output
+#export CONFIG_DEBUG_OUTPUT=y
+#export CONFIG_ENABLE_FUNCTION_TRACING_OUTPUT=y
+#Enable TPM2 pcap output under /tmp
+#export CONFIG_TPM2_CAPTURE_PCAP=y
+
+#On-demand hardware support (modules.cpio)
+CONFIG_LINUX_USB=y
+CONFIG_LINUX_E1000=y
+CONFIG_MOBILE_TETHERING=y
+
+#Modules packed into tools.cpio
+CONFIG_CRYPTSETUP2=y
+CONFIG_FLASHROM=y
+CONFIG_FLASHTOOLS=y
+CONFIG_GPG2=y
+CONFIG_KEXEC=y
+CONFIG_UTIL_LINUX=y
+CONFIG_LVM2=y
+CONFIG_MBEDTLS=y
+CONFIG_PCIUTILS=y
+#Runtime tools to write to EC/MSR
+CONFIG_IOTOOLS=y
+CONFIG_MSRTOOLS=y
+#Remote attestation support
+# TPM2 requirements
+CONFIG_TPM2_TSS=y
+CONFIG_OPENSSL=y
+#Remote Attestation common tools
+CONFIG_POPT=y
+CONFIG_QRENCODE=y
+CONFIG_TPMTOTP=y
+#HOTP based remote attestation for supported USB Security dongle
+#With/Without TPM support
+CONFIG_HOTPKEY=y
+#Nitrokey Storage admin tool (deprecated)
+#CONFIG_NKSTORECLI=n
+#GUI Support
+#Console based Whiptail support(Console based, no FB):
+#CONFIG_SLANG=y
+#CONFIG_NEWT=y
+#FBWhiptail based (Graphical):
+CONFIG_CAIRO=y
+CONFIG_FBWHIPTAIL=y
+#Additional tools (tools.cpio):
+#SSH server (requires ethernet drivers, eg: CONFIG_LINUX_E1000E)
+CONFIG_DROPBEAR=y
+
+#Runtime configuration
+#Automatically boot if HOTP is valid
+export CONFIG_AUTO_BOOT_TIMEOUT=5
+#TPM2 requirements
+export CONFIG_TPM2_TOOLS=y
+export CONFIG_PRIMARY_KEY_TYPE=ecc
+#TPM1 requirements
+#export CONFIG_TPM=y
+export CONFIG_BOOTSCRIPT=/bin/gui-init
+export CONFIG_BOOT_REQ_HASH=n
+export CONFIG_BOOT_REQ_ROLLBACK=n
+export CONFIG_BOOT_KERNEL_ADD=""
+export CONFIG_BOOT_KERNEL_REMOVE="intel_iommu=on intel_iommu=igfx_off"
+export CONFIG_BOOT_DEV="/dev/nvme0n1"
+export CONFIG_BOARD_NAME="Nitropad NV41"
+export CONFIG_FLASHROM_OPTIONS="--force --noverify-all -p internal"
+export CONFIG_AUTO_BOOT_TIMEOUT=5

config/coreboot-omnigul.config

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+CONFIG_VENDOR_GOOGLE=y
+CONFIG_INTEL_GMA_VBT_FILE="3rdparty/blobs/mainboard/google/brya/brya/omnigul/vbt.bin"
+CONFIG_IFD_BIN_PATH="3rdparty/blobs/mainboard/google/brya/brya/omnigul/flashdescriptor.bin"
+CONFIG_ME_BIN_PATH="3rdparty/blobs/mainboard/google/brya/brya/omnigul/me.bin"
+CONFIG_BOARD_GOOGLE_OMNIGUL=y
+CONFIG_HAVE_IFD_BIN=y
+CONFIG_HAVE_ME_BIN=y
+CONFIG_DO_NOT_TOUCH_DESCRIPTOR_REGION=y