refactor(cpu): use the updated IP name for Demeter CPU

Neoverse Demeter CPU has been renamed to Neoverse V2 CPU.
Correspondingly, update the CPU library, file names and other
references to use the updated IP name.

Signed-off-by: Joel Goddard <joel.goddard@arm.com>
Change-Id: Ia4bf45bf47807c06f4c966861230faea420d088f
diff --git a/docs/security_advisories/security-advisory-tfv-9.rst b/docs/security_advisories/security-advisory-tfv-9.rst
index a7b5984..a4db17d 100644
--- a/docs/security_advisories/security-advisory-tfv-9.rst
+++ b/docs/security_advisories/security-advisory-tfv-9.rst
@@ -85,7 +85,7 @@
 +----------------------+
 | Neoverse-V1          |
 +----------------------+
-| Neoverse-Demeter     |
+| Neoverse-V2          |
 +----------------------+
 | Neoverse-Poseidon    |
 +----------------------+