meta-agl-bsp: Update i.MX8MQ EVK support for latest dunfell

meta-agl-bsp: Update i.MX8MQ EVK support for latest dunfell

The layer updates to go to the latest 3.1.4 Yocto dunfell release
broke the imx8mqevk and imx8mqevk-viv builds, though for different
reasons.

imx8mqevk fixes:
- Remove the now upstreamed etnaviv kernel patches that had been
  backported by Walter.
- Turn off btrfs support in the linux-fslc-imx kernel configuration.
  This is required due to meta-freescale having a 5.4 kernel new
  enough to need a lttng-modules fix for btrfs that has not yet been
  backported from the Yocto master branch to dunfell.
- Update the PREFERRED_VERSION over-rides in agl_imx8mqevk.inc to
  match the new versions of libdrm and gstreamer in poky.

imx8mqevk-viv fixes:
- Add weston_8.0.0.imx.bbappend to work around the broken addition
  of a PACKAGECONFIG_remove of "x11 wayland" in the recipe in
  meta-freescale.  Upstream will be engaged to drive getting the
  change reverted.

Bug-AGL: SPEC-3725

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: I259f2d048a9de653a0060afcef17c4410093783a
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/25772
Tested-by: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-build: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
ci-image-boot-test: Jenkins Job builder account <agl-jobbuilder@automotivelinux.org>
Reviewed-by: Tadao Tanikawa <tanikawa.tadao@jp.panasonic.com>