arm64: dts: renesas: ulcb-kf: Add support for TI WL1837

commit 95ff4aab from upstream

This patch adds description of TI WL1837 and links interfaces
to communicate with the IC, namely the SDIO interface to WLAN.

Signed-off-by: Spyridon Papageorgiou <spapageorgiou@de.adit-jv.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>
Signed-off-by: Meng Li <Meng.Li@windriver.com>
Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>