net/lwip: add valid lifetime and preferred lifetime in RA
net/lwip: add valid lifetime and preferred lifetime in RA

According to the RFC 4861, 4.6.2, Preferred Lifetime MUST NOT exceed
the Valid Lifetime fied to avoid preferring addresses that are no longer valid.

This is to meet IPv6Ready Conformance test v6LC.3.2.4 PartD.

Change-Id: Ia8d9a7b8cb0a9d99014acec288a33c1e938f0995
Signed-off-by: Changsoon Kim <c1120524009612ae00648f6848418e342ca4bc0a@samsung.com>

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