at91: do not build image for at91-q5xr5

The kernel image of the at91-q5xr5 is getting too bing now and this is
breaking the build. Remove the image for the at91-q5xr5 from the build
to at least build images for the other devices.

Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>

target/linux/at91/image/legacy.mk

@@ -115,7 +115,7 @@ define Device/at91-q5xr5
   DEVICE_TITLE := Exegin Q5XR5
   KERNEL_SIZE := 2048k
 endef
-TARGET_DEVICES += at91-q5xr5
+#TARGET_DEVICES += at91-q5xr5
 
 define Device/wb45n
   $(Device/evaluation-fit)