refactor(neoverse-rd): rename nrd_plat.c file

The source file nrd_plat.c file is used only by the first generation of
reference design platforms (A75/N1/V1). So, rename this file as
nrd_plat1.c file to denote that this file is used only by the first
generation of reference design platforms. In addition to this, remove
any unused code in this file.

Signed-off-by: Rohit Mathew <rohit.mathew@arm.com>
Change-Id: I15aa9465260789b02a3e8f82af9e26a97092cebf
5 files changed