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