Change in flashrom[master]: ichspi: Rename HSFC FDBC offset macros

[Subrata Banik (Code Review)]

Attention is currently required from: Subrata Banik, Nico Huber, Angel Pons, Anastasia Klimchuk.
Subrata Banik has posted comments on this change. ( https://review.coreboot.org/c/flashrom/+/62894 )

Change subject: ichspi: Rename HSFC FDBC offset macros
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Patch Set 8:

(1 comment)

Commit Message:

https://review.coreboot.org/c/flashrom/+/62894/comment/62f07a9d_2c437a41 
PS6, Line 10: during the data portion of the SPI cycle.
> My understanding is that renaming is needed for the next patch CB:62892 which introduces `HSFC_FDBC(n)`. Subrata please correct me if I am wrong?

you are right Anastasia. Also, I agree with Nico, that macro name/variable names are personal preference for developer hence, with respect to them, IMO this CL renames those macros in meaningful ways to show its true purpose as "HSFC_FDBC_MASK macro represents the number of bytes to shift in or out
during the data portion of the SPI cycle." so, better we use it for masking.