arm64: dts: uniphier: add headphone detect gpio for LD11 global board

This patch adds GPIO for headphone detection on LD11 global board.

Signed-off-by: Katsuhiro Suzuki <suzuki.katsuhiro@socionext.com>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>