arm64: dts: ls1046a: Enable usb3-lpm-capable for usb3 node

Enable USB3 HW LPM feature for ls1046a.

Signed-off-by: Ran Wang <ran.wang_1@nxp.com>
Signed-off-by: Li Yang <leoyang.li@nxp.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>