Change in coreboot[master]: payloads: FILO: Hook up autoboot options

[Paul Menzel (Code Review)]

Attention is currently required from: Nico Huber, Martin Roth, Stefan Reinauer.
Paul Menzel has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56213 )

Change subject: payloads: FILO: Hook up autoboot options
......................................................................

Patch Set 2:

(3 comments)

File payloads/external/FILO/Makefile:

https://review.coreboot.org/c/coreboot/+/56213/comment/9aece3c3_247ebc42 
PS1, Line 36: ifeq ($(CONFIG_FILO_USE_AUTOBOOT),y)
> You stripped the `FILO_` when passing it to the inner Makefile.

Thanks, I updated `Makefile.inc`.

https://review.coreboot.org/c/coreboot/+/56213/comment/3fe920df_4f91a71c 
PS1, Line 39: FILO_
> Same here.

Done

File payloads/external/FILO/Makefile:

https://review.coreboot.org/c/coreboot/+/56213/comment/d0583a67_6b9a10d5 
PS2, Line 39: 	echo "CONFIG_AUTOBOOT_FILE=$(CONFIG_FILO_AUTOBOOT_FILE)" >> filo/.config
That seems to work now, but it overridden later on:

```
echo "# CONFIG_USE_GRUB is not set" >> filo/.config
echo "CONFIG_USE_AUTOBOOT=y" >> filo/.config
echo "CONFIG_AUTOBOOT_FILE=hda1:/vmlinuz root=/dev/sda1 console=tty0 console=ttyS0,115200" >> filo/.config
make -C filo oldconfig LIBCONFIG_PATH=../../../libpayload
mkdir -p /dev/shm/coreboot/payloads/external/FILO/filo/build/drivers/
mkdir -p /dev/shm/coreboot/payloads/external/FILO/filo/build/fs/
mkdir -p /dev/shm/coreboot/payloads/external/FILO/filo/build/main/
mkdir -p /dev/shm/coreboot/payloads/external/FILO/filo/build/main/grub/
mkdir -p /dev/shm/coreboot/payloads/external/FILO/filo/build/x86/
echo "Using binary libpayload, nothing to configure"
Using binary libpayload, nothing to configure
/dev/shm/coreboot/payloads/external/FILO/filo/build/util/kconfig/conf -o Kconfig
.config:74:warning: override: reassigning to symbol USE_GRUB
*
* FILO Configuration
*
Build for architecture
> x86 (TARGET_I386)

2. ARM (TARGET_ARM)
choice[1-2]: 1
Include a MultiBoot header (MULTIBOOT_IMAGE) [Y/n/?] y
*
* Interface Options
*
Use GRUB like interface (USE_GRUB) [N/y/?] n
non-interactive interface (NON_INTERACTIVE) [N/y/?] n
Autoboot a command line after timeout? (USE_AUTOBOOT) [Y/n] y
  Kernel filename and parameters (AUTOBOOT_FILE) [hda1:/vmlinuz root=/dev/hda1 console=tty0 console=ttyS0,115200]
```