[M] Change in coreboot[main]: Add weak function for SMP hart count

[Maximilian Brune (Code Review)]

Attention is currently required from: Philipp Hug, Ron Minnich.

Hello Philipp Hug, Ron Minnich, build bot (Jenkins),

I'd like you to reexamine a change. Please visit

https://review.coreboot.org/c/coreboot/+/81082?usp=email

to look at the new patch set (#4).

The following approvals got outdated and were removed:
Verified+1 by build bot (Jenkins)

Change subject: Add weak function for SMP hart count
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Add weak function for SMP hart count

Signed-off-by: Maximilian Brune 
Change-Id: Icc53185991fed4dbed032a52e51ff71d085ad587
---
M src/arch/riscv/Kconfig
M src/arch/riscv/include/arch/smp/smp.h
M src/arch/riscv/smp.c
3 files changed, 57 insertions(+), 45 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/82/81082/4