refactor(sgi): replace all references to "sgi" within scripts

Currently, some of the platform utility scripts use "sgi" as a prefix to
name certain variables. As these platforms have moved away from "sgi",
update the prefix to "nrd" for the same.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: I0fa094e6d6fb08972b3c7d246b3b9341b50fa2ab
diff --git a/rdn1edge_utils.sh b/rdn1edge_utils.sh
index 636483e..37c3a02 100644
--- a/rdn1edge_utils.sh
+++ b/rdn1edge_utils.sh
@@ -12,8 +12,8 @@
 # Pre-built SCP/MCP binaries
 scp_mcp_prebuilts="${scp_mcp_prebuilts:-$scp_mcp_downloads/rdn1e1/release}"
 
-kernel_list[sgi-busybox]="$nrd_prebuilts/Image"
-initrd_list[sgi-ramdisk]="$nrd_prebuilts/ramdisk-busybox.img"
+kernel_list[nrd-busybox]="$nrd_prebuilts/Image"
+initrd_list[nrd-ramdisk]="$nrd_prebuilts/ramdisk-busybox.img"
 
 scp_ram_addr=0x0bd80000
 mcp_ram_addr=0x0be00000
diff --git a/rdv1_utils.sh b/rdv1_utils.sh
index a0d0a2d..6486a42 100644
--- a/rdv1_utils.sh
+++ b/rdv1_utils.sh
@@ -13,8 +13,8 @@
 scp_mcp_prebuilts="${scp_mcp_prebuilts:-$scp_mcp_downloads/rdv1/release}"
 
 
-kernel_list[sgi-busybox]="$nrd_prebuilts/Image"
-initrd_list[sgi-ramdisk]="$nrd_prebuilts/ramdisk-busybox.img"
+kernel_list[nrd-busybox]="$nrd_prebuilts/Image"
+initrd_list[nrd-ramdisk]="$nrd_prebuilts/ramdisk-busybox.img"
 
 scp_ram_addr=0x0bd80000
 mcp_ram_addr=0x0BF80000
diff --git a/run_config/fvp-linux.nrd b/run_config/fvp-linux.nrd
index 946c00c..e822b83 100644
--- a/run_config/fvp-linux.nrd
+++ b/run_config/fvp-linux.nrd
@@ -6,8 +6,8 @@
 #
 
 fetch_tf_resource() {
-	image="kernel" type="sgi-busybox" get_boot_image
-	image="initrd" type="sgi-ramdisk" get_boot_image
+	image="kernel" type="nrd-busybox" get_boot_image
+	image="initrd" type="nrd-ramdisk" get_boot_image
 
 	url="$nrd_prebuilts/grub-busybox.img" saveas="busybox.bin" fetch_file
 	url="$nrd_prebuilts/ramdisk-busybox.img" saveas="ramdisk.bin" fetch_file
diff --git a/sgi575_utils.sh b/sgi575_utils.sh
index 3d0c11b..fafdee9 100644
--- a/sgi575_utils.sh
+++ b/sgi575_utils.sh
@@ -12,8 +12,8 @@
 # Pre-built SCP/MCP binaries
 scp_mcp_prebuilts="${scp_mcp_prebuilts:-$scp_mcp_downloads/sgi575/release}"
 
-kernel_list[sgi-busybox]="$nrd_prebuilts/Image"
-initrd_list[sgi-ramdisk]="$nrd_prebuilts/ramdisk-busybox.img"
+kernel_list[nrd-busybox]="$nrd_prebuilts/Image"
+initrd_list[nrd-ramdisk]="$nrd_prebuilts/ramdisk-busybox.img"
 
 scp_ram_addr=0x0bd80000
 mcp_ram_addr=0x0be00000