Change in coreboot[master]: libpayload: Add struct name "channel" for external access

[Hung-Te Lin (Code Review)]

Attention is currently required from: Julius Werner, Xixi Chen.
Hung-Te Lin has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/62850 )

Change subject: libpayload: Add struct name "channel" for external access
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Patch Set 2:

(1 comment)

Patchset:

PS2: 
Is that true? I thought struct fields are accessed by variable name instead of type name, and channel is the variable name.

Example:
```
struct {
  int a;
  struct {
   int b;
  } c[0];
} d;

int main() {
  d.a = 1;
  d.c[0].b = 0;
  return 0;
}
```

I can successfully compile this program.