ramips: use lzma-loader for Wevo devices

ramips: use lzma-loader for Wevo devices

As kernel size increased it start to fail to load squishfs image,
using lzma-loader fixed it.
wevo_11acnas is almost same device as w2914ns-v2 except ram size,
so I expect same thing would've happen in that device too.

Signed-off-by: Seo Suchan <abnoeh@mail.com>
Reviewed-by: Sungbo Eo <mans0n@gorani.run>
(cherry picked from commit ca6954e2dc3faa32eec54b93bda996c874409675)