Change in flashrom[master]: lspcon_i2c_spi: support a devpath option

[Peter Marheine (Code Review)]

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

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

    https://review.coreboot.org/c/flashrom/+/51967

to look at the new patch set (#3).

Change subject: lspcon_i2c_spi: support a devpath option
......................................................................

lspcon_i2c_spi: support a devpath option

Some callers may find it easier to provide the path to an I2C device
at which to communicate with the device, rather than specify the bus
number- doing so might involve trying to parse a path to extract the
number only for flashrom to do the reverse, which is error-prone and
unnecessary.

This change adds support for a `devpath` option, continuing to
allow `bus` and requiring only one of them be specified.

TEST=Verified --flash-size outputs correct values with both
     devpath=/dev/i2c-7 and bus=7, as well as noting that one is
     required if neither is specified and only one may be specified
     if both are given.

Signed-off-by: Peter Marheine <[e-mail]>
Change-Id: Id2adf8a307b9205ce5e5804a6c3e22f19d0c34c9
---
M i2c_helper.h
M i2c_helper_linux.c
M lspcon_i2c_spi.c
3 files changed, 79 insertions(+), 50 deletions(-)


  git pull ssh://review.coreboot.org:29418/flashrom refs/changes/67/51967/3
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Gerrit-Project: flashrom
Gerrit-Branch: master
Gerrit-Change-Id: Id2adf8a307b9205ce5e5804a6c3e22f19d0c34c9
Gerrit-Change-Number: 51967
Gerrit-PatchSet: 3
Gerrit-Owner: Peter Marheine <[e-mail]>
Gerrit-Reviewer: Angel Pons <[e-mail]>
Gerrit-Reviewer: Edward O'Callaghan <[e-mail]>
Gerrit-Reviewer: build bot (Jenkins) <[e-mail]>
Gerrit-CC: Daniel Campello <[e-mail]>
Gerrit-Attention: Peter Marheine <[e-mail]>
Gerrit-MessageType: newpatchset