plat(fvp): use generic image fetching functions

Some generic functions have been provided for fetching prebuilt images -
use these for FVP runs.

Signed-off-by: Harrison Mutai <harrison.mutai@arm.com>
Change-Id: I785890c9b0370279230dfd6f71a54bcdc0ebc9c3
diff --git a/rdv1_utils.sh b/rdv1_utils.sh
index 7884aeb..7ef0e44 100644
--- a/rdv1_utils.sh
+++ b/rdv1_utils.sh
@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 #
-# Copyright (c) 2020-2021, Arm Limited. All rights reserved.
+# Copyright (c) 2020-2023, Arm Limited. All rights reserved.
 #
 # SPDX-License-Identifier: BSD-3-Clause
 #
@@ -13,8 +13,8 @@
 scp_mcp_prebuilts="${scp_mcp_prebuilts:-$scp_mcp_downloads/rdv1/release}"
 
 
-fvp_kernels[fvp-sgi-busybox]="$sgi_prebuilts/Image"
-fvp_initrd_urls[fvp-sgi-ramdisk]="$sgi_prebuilts/ramdisk-busybox.img"
+kernel_list[sgi-busybox]="$sgi_prebuilts/Image"
+initrd_list[sgi-ramdisk]="$sgi_prebuilts/ramdisk-busybox.img"
 
 scp_ram_addr=0x0bd80000
 mcp_ram_addr=0x0BF80000