(GTA02, kernel) introduction of GTA02v6

[Andy Green]

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Somebody in the thread at some point said:

|   - set pcb_rev in the environment (do you still need this ?)

In the end changing the U-Boot env to actually plant it on the
commandline seemed much harder than adding a /sys node... how the Gods
must laugh.

|   For the u-boot compatibility check in DFU, it identifies itself as
|   GTA02v5, no matter whether it was configured for GTA02v5 or GTA02v6.

If I understood it all, why not throw out the v6 concept in U-Boot and
from now on all GTA02 are v5 for the compile-type config system.  New
things mean there is a dynamic enum to take care of it from GPIO version
states.

| So far, I don't have any changes for u-boot or kernel that actually
| need to distinguish GTA02v5 and GTA02v6. If you don't either, I
| wonder why there was all that urgency yesterday about unifying what
| was already the same ... :)

The motion sensors are different on A6, affecting the kernel: so we need
the PCB rev stuff in the kernel to actually work.

- -Andy
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