platform: generic: Generate platform override module list at compile-time

Instead of having platform override module list hard-coded in the C source,
we generate it using carray.sh at compile-time.

Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Reviewed-by: Atish Patra <atishp@rivosinc.com>

platform/generic/platform_override_modules.carray

@@ -0,0 +1,3 @@
+HEADER: platform_override.h
+TYPE: const struct platform_override
+NAME: platform_override_modules