CS and MODE are a bit too generic macros and may conflict with headers
defined by the CPU, like in the QN908x case.
This patch renames them to BUS_CS and BUS_MODE to keep it consistent
with the other BUS names.
The expandable GPIO API requires the comparison of structured GPIO types. This means that inline functions must be used instead of direct comparisons. For the migration process, drivers must first be changed so that they use the inline comparison functions.
