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

[Angel Pons (Code Review)]

Attention is currently required from: Peter Marheine.
Angel Pons has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/51967 )

Change subject: lspcon_i2c_spi: support a devpath option
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Patch Set 1:

(2 comments)

File lspcon_i2c_spi.c:

https://review.coreboot.org/c/flashrom/+/51967/comment/03d827eb_6153905c 
PS1, Line 436: /* TODO: remove this out of the specific SPI master implementation. */
Idea for another patch: Provide a `i2c_open_from_programmer_param` I2C helper function that returns a fd for an I2C device, using programmer params `devpath` and `bus`?

https://review.coreboot.org/c/flashrom/+/51967/comment/8e1130ba_c91c0abc 
PS1, Line 486: 		msg_perr("%s: one of devpath or bus must be specified\n", __func__);
If both arguments are specified, `bus` is silently ignored. Should this case be treated as an error?