ti33x: Update wlcore fixup location
ti33x: Update wlcore fixup location

'wlcore' node is now (kernel v4.4) a child-node of 'mmc3', this needs
to be reflected in the barebox environment.

Signed-off-by: Yotam Ben Dosa <82ef5e5da0c902a69e7c97db680acdcde844914f@linux4biz.com>
Signed-off-by: Stefan Müller-Klieser <a3e08e35e4a42be768e7d0e76ae1ba321c2a66dd@phytec.de>

PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec,PHYTEC-Messtechnik-GmbH/meta-phytec