top: Rename "blob" to "firmware" everywhere

This patch renames "blob" to "firmware" everywhere for better
and intutive naming.

Signed-off-by: Anup Patel <anup@brainfault.org>

firmware/fw_payload.elf.ldS

@@ -0,0 +1,26 @@
+/*
+ * Copyright (c) 2018 Western Digital Corporation or its affiliates.
+ *
+ * Authors:
+ *   Anup Patel <anup.patel@wdc.com>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+OUTPUT_ARCH(riscv)
+ENTRY(_start)
+
+SECTIONS
+{
+	#include "fw_common.ldS"
+
+	. = FW_TEXT_START + FW_PAYLOAD_OFFSET;
+
+	.payload :
+	{
+		PROVIDE(_payload_start = .);
+		*(.payload)
+		. = ALIGN(8);
+		PROVIDE(_payload_end = .);
+	}
+}