linux-xlnx: KCONFIG_MODE values have changed, update to 'alldefconfig'
linux-xlnx: KCONFIG_MODE values have changed, update to 'alldefconfig'

In commit 0f698dfd1c8bbc0d53ae7977e26685a7a3df52a3 of oe-core, the
values for KCONFIG_MODE have changed, the values are no longer flags.

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

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