packagegroup-fslc-gstreamer1.0: Fix DISTRO_FEATURE wayland check

The BSP present in meta-fsl-arm provides hardware acceleration
for wayland only in case 'wayland' is present in DISTRO_FEATURES
and 'x11' is not.

The default poky DISTRO_FEATURE has both 'wayland' and 'x11' at
same time. For this scenario, and it is a X11 hardware acceleration
for BSP from meta-fsl-arm.

It means that, only verify if 'wayland' is in DISTRO_FEATURE is not enough
to deferminate a Wayland distribution, when working with meta-fsl-arm.
It is needed to check if 'x11' is not.

Signed-off-by: Daiane Angolini <daiane.angolini@freescale.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>