arch/arm: Pass cbmem_top to ramstage via calling argument

This solution is very generic and can in principle be implemented on
all arch/soc.

Instead trying to figure out which files can be removed from stages
and which cbmem_top implementations need with preprocessor, rename all
cbmem_top implementation to cbmem_top_romstage.

Mechanisms set in place to pass on information from rom- to ram-stage
will be placed in a followup commit.

Change-Id: If31f0f1de17ffc92c9397f32b26db25aff4b7cab
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
---
M src/arch/arm/Kconfig
M src/arch/arm/include/arch/stages.h
M src/arch/arm/stages.c
M src/cpu/ti/am335x/Makefile.inc
M src/mainboard/emulation/qemu-armv7/Makefile.inc
M src/soc/nvidia/tegra124/Makefile.inc
M src/soc/nvidia/tegra124/verstage.c
M src/soc/rockchip/rk3288/Makefile.inc
M src/soc/samsung/exynos5250/Makefile.inc
M src/soc/samsung/exynos5420/Makefile.inc
10 files changed, 8 insertions(+), 10 deletions(-)