MLK-18152-5 mx6sxsabreauto: Update board codes to align with v2019.04

MLK-18152-5 mx6sxsabreauto: Update board codes to align with v2019.04

Update DM PMIC settings and LDO bypass support.
Add BMODE support.
Add LVDS and LCD splash screen support
Add two ethernet controller support
Update environment settings
Add plugin support

Signed-off-by: Ye Li <ye.li@nxp.com>
(cherry picked from commit beaea14e18f138249521f0de8a8ef902d555cb89)
(cherry picked from commit c766595b0be6676b57886114f383b2d1c529ce29)
(cherry picked from commit e035f2c4746ed35fa39bc9d11d70ff329c1e37fd)