machine-xilinx-default.inc: Only recommend mali module for linux-xlnx
machine-xilinx-default.inc: Only recommend mali module for linux-xlnx

Only recommend the kernel-module-mali if the kernel provider is
currently linux-xlnx. This is due to linux-xlnx providing the support
for this external module, other kernels such as linux-yocto do not
support it.

Signed-off-by: Nathan Rossi <2e8aa918660411855c6d44d5bb2da677aa033255@nathanrossi.com>

Xilinx/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx,Xilinx/meta-xilinx,nathanrossi/meta-xilinx,nathanrossi/meta-xilinx