As x86-generic is compiled to pentium4 (and newer) there is a need for
a subtarget for older devices. The x86-legacy subtarget is set to
compile to pentium (and newer) and should support even very old devics.

x86-legacy includes the packages from x86.inc to only maintain one
package list. The three excludes are because the packages do not exist
for x86-legacy.

Hardware specification:
- SOC: Qualcomm QCA9563 @ 775MHz
- Flash: GigaDevice GD25Q64CSIG (8MiB)
- RAM: Zentel A3R1GE40JBF (128 MiB DDR2)
- Ethernet: Qualcomm QCA8337N: 4x 1Gbps LAN + 1x 1Gbps WAN
- Wireless:
  - 2.4GHz (bgn) QCA9563 integrated (3x3)
  - 5GHz (ac) Qualcomm QCA9886 (2x2)
- Button: 1x power, 1x reset, 1x wps
- LED: 6x LEDs: power, wlan2g, wlan5g, lan, wan, wps
- UART: There's no UART header on the board

This commit removes the broken flag for the ipq806x-generic target,
as the first device (NETGEAR R7800) now has full support in Gluon

This commit accounts for the target renaming which was done in upstream
commit 7407e723991 ("ipqx0xx: add Generic subtarget")

This commit accounts for the target renaming which was done in upstream
commit 7407e723991 ("ipqx0xx: add Generic subtarget")

The device is broken until the next release. The LEDs are currently not
working (fixed in current OpenWRT master).

Also give a brief explanation about the BROKEN status being dependent on
the WiFi chip used and not the SoC family in general.

The driver has stablized enough to officially support ramips-mt76x8 devices
again. At least remove BROKEN for VoCore 2 (as it was supported before).

The MT76x8 is currently not stable enough for worry-free use with Gluon.
It suffers from reboots in intervals as little as 12 hours or WiFi
freezes for several hours.

It may be unflagged as soon the situation with mt76 got better.

This commit adds support for the new ipq40xx target.

defaults to 11s, allowing to build devices without IBSS-support

obsoletes GLUON_ATH10K_MESH

There is no wifi, so there is no bad wifi.

[Matthias Schiffer: rebase onto master]

This device has built in wifi we should include it at least for experiments.

Completely untested for now.

Closes #835

Remove obsolete x86-xen_domu definition, it has been merged into
x86-generic.

Needs more testing, high packet loss at the moment.

Fixes #121

Based-on-patch-by: Tobias Hachmer <tobias@hachmer.de>

Config for rootfs and grub is not needed anymore (https://dev.openwrt.org/ticket/18074)

Config file not needed anymore (set implicitly by gluon now)

Avoid empty vars