ARM64: tegra21: Enable Ext4 encryption

ARM64: tegra21: Enable Ext4 encryption

This change enables ext4 file based encryption

Bug 200298311
Bug 200345207

Change-Id: I407ad491b27d26429827ba67e1c4162ab56b4d49
Signed-off-by: venkata jagadish <vjagadish@nvidia.com>
Reviewed-on: http://git-master/r/1470951
GVS: Gerrit_Virtual_Submit
Reviewed-by: Laxman Dewangan <ldewangan@nvidia.com>
(cherry picked from commit a5869debe00cd1533d4907df5c98e268829bdfb3)
Reviewed-on: https://git-master.nvidia.com/r/1558014
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>