rpi3: Move NS-DRAM out of the protected region

The Non-secure DRAM region shouldn't be protected in the range specified
in the Linux command line with memmap.

This change also increases the size of the Secure DRAM region.

Change-Id: I306e9e443a84b834c99739f54a534a3ca3be2424
Signed-off-by: Antonio Nino Diaz <antonio.ninodiaz@arm.com>
diff --git a/docs/plat/rpi3.rst b/docs/plat/rpi3.rst
index 8ad11c8..fbf753b 100644
--- a/docs/plat/rpi3.rst
+++ b/docs/plat/rpi3.rst
@@ -122,9 +122,9 @@
                |   Secure SRAM   | BL2, BL31
     0x10100000 +-----------------+
                |   Secure DRAM   | BL32 (Secure payload)
-    0x10C00000 +-----------------+
-               | Non-secure DRAM | BL33
     0x11000000 +-----------------+
+               | Non-secure DRAM | BL33
+               +-----------------+
                |                 |
                |       ...       |
                |                 |