Change in flashrom[master]: lspcon, realtek_mst: move i2c bus resolution from params to i2c_helper

[Peter Marheine (Code Review)]

Attention is currently required from: Sam McNally, Peter Marheine.
Hello Sam McNally, build bot (Jenkins), Edward O'Callaghan,

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

https://review.coreboot.org/c/flashrom/+/52405

to look at the new patch set (#7).

Change subject: lspcon, realtek_mst: move i2c bus resolution from params to i2c_helper
......................................................................

lspcon, realtek_mst: move i2c bus resolution from params to i2c_helper

The general pattern of taking either a bus number or device path should
apply to both of these programmers, so change the I2C API to provide a
common way to get the device path and reduce the duplication between
the two programmers.

TEST=Both programmers now accept either bus= or devpath=

Change-Id: Ieea57b2445f3aca16c87d8f839dff131009531a0
---
M i2c_helper.h
M i2c_helper_linux.c
M lspcon_i2c_spi.c
M realtek_mst_i2c_spi.c
4 files changed, 89 insertions(+), 128 deletions(-)

git pull ssh://review.coreboot.org:29418/flashrom refs/changes/05/52405/7