templates/default: do not separately enable sdl in qemu-system-native

The recipe now does it directly.

(From meta-yocto rev: b12adb95ac7eceb7e5c5a111fb7a9450626d63ef)

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta-poky/conf/templates/default/local.conf.sample

@@ -245,9 +245,8 @@ BB_DISKMON_DIRS ??= "\
 #
 # Qemu configuration
 #
-# By default native qemu will build with a builtin VNC server where graphical output can be
-# seen. The line below enables the SDL UI frontend too.
-PACKAGECONFIG:append:pn-qemu-system-native = " sdl"
+# By default native qemu will build with a builtin VNC server and a SDL UI frontend
+# where graphical output can be seen.
 # By default libsdl2-native will be built, if you want to use your host's libSDL instead of 
 # the minimal libsdl built by libsdl2-native then uncomment the ASSUME_PROVIDED line below.
 #ASSUME_PROVIDED += "libsdl2-native"