Replace all SCP FW (BL0, BL3-0) references

This patch replaces all references to the SCP Firmware (BL0, BL30,
BL3-0, bl30) with the image terminology detailed in the TF wiki
(https://github.com/ARM-software/arm-trusted-firmware/wiki):

    BL0          -->  SCP_BL1
    BL30, BL3-0  -->  SCP_BL2
    bl30         -->  scp_bl2

This change affects code, documentation, build system, tools and
platform ports that load SCP firmware. ARM plaforms have been
updated to the new porting API.

IMPORTANT: build option to specify the SCP FW image has changed:

    BL30 --> SCP_BL2

IMPORTANT: This patch breaks compatibility for platforms that use BL2
to load SCP firmware. Affected platforms must be updated as follows:

    BL30_IMAGE_ID --> SCP_BL2_IMAGE_ID
    BL30_BASE --> SCP_BL2_BASE
    bl2_plat_get_bl30_meminfo() --> bl2_plat_get_scp_bl2_meminfo()
    bl2_plat_handle_bl30() --> bl2_plat_handle_scp_bl2()

Change-Id: I24c4c1a4f0e4b9f17c9e4929da815c4069549e58
diff --git a/docs/auth-framework.md b/docs/auth-framework.md
index b910eae..f6455b9 100644
--- a/docs/auth-framework.md
+++ b/docs/auth-framework.md
@@ -211,8 +211,9 @@
 3.  Tracking which images have been verified. In case an image is a part of
     multiple CoTs then it should be verified only once e.g. the Trusted World
     Key Certificate in the TBBR-Client spec. contains information to verify
-    BL3-0, BL3-1, BL3-2 each of which have a separate CoT. (This responsibility
-    has not been described in this document but should be trivial to implement).
+    SCP_BL2, BL3-1, BL3-2 each of which have a separate CoT. (This
+    responsibility has not been described in this document but should be
+    trivial to implement).
 
 4.  Reusing memory meant for a data image to verify authentication images e.g.
     in the CoT described in Diagram 2, each certificate can be loaded and
@@ -632,7 +633,7 @@
 and thus all CoTs must present:
 
 *   `BL2`
-*   `BL3-0` (platform specific)
+*   `SCP_BL2` (platform specific)
 *   `BL3-1`
 *   `BL3-2` (optional)
 *   `BL3-3`