drivers/at86rf2xx: add support for configuring PHY modes

[benpicco]

Contribution description

This implements getting & setting O-QPSK options with #12171
This allows for setting the rate mode (values 0-4, for 250, 500, 1000 & 2000 kbit/s operation) as well as chip rate (1000 kchip/s and 400 kchip/s for O-QPSK and 600 kchip/s and 300 kchip/s for BPSK).

The proprietary rate mode 2 on at86rf233 is compatible with the legacy high data rate mode on at86rf215.

Testing procedure

Or on samr30-xpro you should now be able to to the following:

ifconfig 7 set rate_mode 2
ifconfig 7 set chip_rate 400

You should get

 Iface  7  HWaddr: 34:82  Channel: 0  Page: 2  NID: 0x23 PHY: O-QPSK 
            chip rate: 400 rate mode: 2 (legacy) 
           Long HWaddr: 79:7A:34:2F:9D:73:B4:82

On samr21-xpro, setting the chip_rate should fail.

Issues/PRs references

depends on #12171

[miri64]

@jia200x is this a duplicate of #12069?

[benpicco]

@miri64 no this is to expose some modulation options that the chip provides to ifconfig.

[PeterKietzmann]

@jia200x I think this is a candidate for you

[jia200x]

I'm back!

@jia200x is this a duplicate of #12069?

Not, not at all. #12069 just changes the representation of PHY states. This PR adds the means for configuring new PHY modes.

[stale]

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