models: Add edk2 config for QEMU

Ensure QEMU builds with the correct edk2 options by providing a config
file like the other models.

Signed-off-by: Tim Crawford <tcrawford@system76.com>

models/qemu/edk2.config

@@ -0,0 +1,8 @@
+BOOTLOADER=COREBOOT
+DISABLE_SERIAL_TERMINAL=TRUE
+PLATFORM_BOOT_TIMEOUT=2
+PS2_KEYBOARD_ENABLE=TRUE
+#SECURE_BOOT_ENABLE=TRUE
+SERIAL_DRIVER_ENABLE=FALSE
+SHELL_TYPE=NONE
+TPM_ENABLE=TRUE