Bluetooth: has: Add support for Read Presets Request operation

This extends client implementation with Read Presets Request operation
support.
The implementation can maintain up to BT_L2CAP_TX_BUF_COUNT control
point requests so that user could perform/queue another Control Point
Operation if one is ongoing. E.g. preset can be selected from Read Preset
Response notification context or perform multiple operations if EATT
enabled.

Signed-off-by: Mariusz Skamra <mariusz.skamra@codecoup.pl>
3 files changed