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_io_storage.c b/plat/arm/common/arm_io_storage.c
index 56d711c..8c5845c 100644
--- a/plat/arm/common/arm_io_storage.c
+++ b/plat/arm/common/arm_io_storage.c
@@ -53,8 +53,8 @@
 	.uuid = UUID_TRUSTED_BOOT_FIRMWARE_BL2,
 };
 
-static const io_uuid_spec_t bl30_uuid_spec = {
-	.uuid = UUID_SCP_FIRMWARE_BL30,
+static const io_uuid_spec_t scp_bl2_uuid_spec = {
+	.uuid = UUID_SCP_FIRMWARE_SCP_BL2,
 };
 
 static const io_uuid_spec_t bl31_uuid_spec = {
@@ -133,9 +133,9 @@
 		(uintptr_t)&bl2_uuid_spec,
 		open_fip
 	},
-	[BL30_IMAGE_ID] = {
+	[SCP_BL2_IMAGE_ID] = {
 		&fip_dev_handle,
-		(uintptr_t)&bl30_uuid_spec,
+		(uintptr_t)&scp_bl2_uuid_spec,
 		open_fip
 	},
 	[BL31_IMAGE_ID] = {