ARM64: DT: tegra210: Add built-in support for SDMMC4

ARM64: DT: tegra210: Add built-in support for SDMMC4

--built_in was added in patch
http://git-master/r/#/c/436131/
but removed in below patch
http://git-master/r/#/c/409255/
-enabling built-in for sdmmc4

Change-Id: Ie18218490537358a69a324d2922bddea60fc37de
Signed-off-by: Naveen Kumar Arepalli <naveenk@nvidia.com>
Reviewed-on: http://git-master/r/454054
Reviewed-by: Bitan Biswas <bbiswas@nvidia.com>
Tested-by: Bitan Biswas <bbiswas@nvidia.com>