bladeRF-cli: Added DC offset calibration table generation
libbladeRF: Added bladerf_load_calibration_table()

This function provides the ability to load DC offset tables, and will
be used to support loading of IQ balance correction tables in the future.
bladeRF-cli: Added 'load cal[ibration] <file>' support.
libbladeRF, bladeRF-cli: DC calibration table entry size fixes, added fields

The DC calibration table entries' offset values are int16_t, not
uint8_t. Although the actual register values are uint8_t, the libbladeRF
interface has normalized them.

We might want to bypass this normalization to reduce the size of this
calibration table, especially if we want to fit it in flash.
libbladeRF: Apply LMS reg values and reset freq when loading DC cal tbl
libbladeRF: Added a means to clear and disable calibration tables
bladeRF-cli: Reduced default dc cal table frequency granularity
bladeRF-cli: Added additional information to DC cal table generation
libbladeRF: Fixed table assignments during TX DC cal table loading

Items were being assigned to the RX module
Merge remote-tracking branch 'upstream/dev-cal'