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/plat/arm/common/arm_bl2_setup.c b/plat/arm/common/arm_bl2_setup.c
index a44ec1d..0ee1b0d 100644
--- a/plat/arm/common/arm_bl2_setup.c
+++ b/plat/arm/common/arm_bl2_setup.c
@@ -90,7 +90,7 @@
 #pragma weak bl2_plat_get_bl31_ep_info
 #pragma weak bl2_plat_flush_bl31_params
 #pragma weak bl2_plat_set_bl31_ep_info
-#pragma weak bl2_plat_get_bl30_meminfo
+#pragma weak bl2_plat_get_scp_bl2_meminfo
 #pragma weak bl2_plat_get_bl32_meminfo
 #pragma weak bl2_plat_set_bl32_ep_info
 #pragma weak bl2_plat_get_bl33_meminfo
@@ -235,12 +235,12 @@
 }
 
 /*******************************************************************************
- * Populate the extents of memory available for loading BL3-0 (if used),
+ * Populate the extents of memory available for loading SCP_BL2 (if used),
  * i.e. anywhere in trusted RAM as long as it doesn't overwrite BL2.
  ******************************************************************************/
-void bl2_plat_get_bl30_meminfo(meminfo_t *bl30_meminfo)
+void bl2_plat_get_scp_bl2_meminfo(meminfo_t *scp_bl2_meminfo)
 {
-	*bl30_meminfo = bl2_tzram_layout;
+	*scp_bl2_meminfo = bl2_tzram_layout;
 }
 
 /*******************************************************************************