refactor(neoverse-rd): remove soc_css.mk from common makefile

The soc_css.mk file within the plat/arm/soc module currently implements
initialization functions for the PCIe controller and NIC400 within the
SOC specification. However, as none of the Neoverse reference design
platforms necessitate the initialization of PCIe or NIC400, remove the
soc_css.mk from the common makefile.

Additionally, empty initialization functions for PCIe and NIC400 are
added to satisfy the requirements of the plat/arm common code, which
expects these functions to be present.

Signed-off-by: Rohit Mathew <Rohit.Mathew@arm.com>
Change-Id: Ia431af62f48fc224962d64902dd3acfbf0b93935
3 files changed