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/include/plat/arm/css/common/css_def.h b/include/plat/arm/css/common/css_def.h
index 3fa4c15..dcc7790 100644
--- a/include/plat/arm/css/common/css_def.h
+++ b/include/plat/arm/css/common/css_def.h
@@ -82,7 +82,7 @@
  * primary, according to the shift and mask definitions below.
  *
  * Note that the value stored at this address is only valid at boot time, before
- * the BL3-0 image is transferred to SCP.
+ * the SCP_BL2 image is transferred to SCP.
  */
 #define SCP_BOOT_CFG_ADDR		(ARM_TRUSTED_SRAM_BASE + 0x80)
 #define PRIMARY_CPU_SHIFT		8
@@ -110,11 +110,11 @@
  ************************************************************************/
 
 /*
- * Load address of BL3-0 in CSS platform ports
- * BL3-0 is loaded to the same place as BL3-1.  Once BL3-0 is transferred to the
+ * Load address of SCP_BL2 in CSS platform ports
+ * SCP_BL2 is loaded to the same place as BL3-1.  Once SCP_BL2 is transferred to the
  * SCP, it is discarded and BL3-1 is loaded over the top.
  */
-#define BL30_BASE			BL31_BASE
+#define SCP_BL2_BASE			BL31_BASE
 
 #define SCP_BL2U_BASE			BL31_BASE