hidpp20drv: rename field 'base' into 'dev'
hidpp20drv: rename field 'base' into 'dev'

'base' was wrongly inherited from the hidpp10 implementation, but actually
it makes no sense in this context.
Also, we want to reserve the keyword 'base' for when we introduce
hidpp20_device.

Signed-off-by: Benjamin Tissoires <7a0e50e3f6a0939db82b6a8a423c08a163896f41@gmail.com>

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