meta-agl-bsp: Use pixman renderer on qemuarm/qemuarm64

meta-agl-bsp: Use pixman renderer on qemuarm/qemuarm64

Using GL-renderer on qemu without any acceleration support such as
kvm results pretty much higher cpu consumption. To avoid it, we'll
use pixman-renderer on qemuarm and qemuarn64.

Bug-AGL: SPEC-4165

Signed-off-by: Hiroyuki Ishii <ishii.hiroyuki002@jp.panasonic.com>
Change-Id: Iaffe1bd624d6f1c6df9af67e33cc1fa2168293ac
Reviewed-on: https://gerrit.automotivelinux.org/gerrit/c/AGL/meta-agl/+/27066
Reviewed-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>
Tested-by: Jan-Simon Moeller <jsmoeller@linuxfoundation.org>