board/stm32l4r9ai-disco: use DEPPATH in .depend target
board/stm32l4r9ai-disco: use DEPPATH in .depend target

Because the partitions.c file is in os/board/common folder,
Makefile should pass the path of common folder.
This commit fixes build break.

Signed-off-by: sunghan-chang <c954e25285721d8faa8b1a5c1ae2ef5a35338d32@samsung.com>

jeongchanKim/TizenRT,jsdosa/TizenRT,an4967/TizenRT,pillip8282/TizenRT,pillip8282/TizenRT,Samsung/TizenRT,davidfather/TizenRT,Samsung/TizenRT,jeongarmy/TizenRT,chanijjani/TizenRT,jsdosa/TizenRT,Samsung/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,sunghan-chang/TizenRT,sunghan-chang/TizenRT,chanijjani/TizenRT,jeongarmy/TizenRT,junmin-kim/TizenRT,chanijjani/TizenRT,junmin-kim/TizenRT,jeongchanKim/TizenRT,jsdosa/TizenRT,sunghan-chang/TizenRT,Samsung/TizenRT,jsdosa/TizenRT,jsdosa/TizenRT,jeongarmy/TizenRT,jeongchanKim/TizenRT,pillip8282/TizenRT,jeongarmy/TizenRT,jsdosa/TizenRT,jsdosa/TizenRT,davidfather/TizenRT,sunghan-chang/TizenRT,jeongchanKim/TizenRT,an4967/TizenRT,pillip8282/TizenRT,jeongarmy/TizenRT,davidfather/TizenRT,junmin-kim/TizenRT,an4967/TizenRT,an4967/TizenRT,davidfather/TizenRT,chanijjani/TizenRT,davidfather/TizenRT,pillip8282/TizenRT,junmin-kim/TizenRT,sunghan-chang/TizenRT,sunghan-chang/TizenRT,an4967/TizenRT,chanijjani/TizenRT,jeongchanKim/TizenRT,jeongchanKim/TizenRT,jeongarmy/TizenRT,an4967/TizenRT,junmin-kim/TizenRT,chanijjani/TizenRT,Samsung/TizenRT,sunghan-chang/TizenRT,pillip8282/TizenRT,an4967/TizenRT,chanijjani/TizenRT,junmin-kim/TizenRT,jeongarmy/TizenRT,Samsung/TizenRT,pillip8282/TizenRT,davidfather/TizenRT,Samsung/TizenRT,davidfather/TizenRT