arm: dts: k3-j7200-main: Add DT node for torrent serdes

Add DT node for torrent serdes. This is in sync with v5.13 Linux Kernel.

Signed-off-by: Aswath Govindraju <a-govindraju@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Lokesh Vutla <lokeshvutla@ti.com>
Link: https://lore.kernel.org/r/20210721155849.20994-13-kishon@ti.com