The calls to secure ddr regions on rk3288 and rk3399 use parameters of
base and size - as it custom for specifying memory regions, but the
functions themself expect start and endpoints of the area.

This only works by chance for the TZRAM, as it starts a 0x0 and therefore
its end location is the same as its size.

To not fall into a trap later on adapt the functions to really take
base+size parameters.

Signed-off-by: Heiko Stuebner <heiko.stuebner@theobroma-systems.com>
Change-Id: Idb9fab38aa081f3335a4eca971e7b7f6757fbbab