v3.2.1

• HAL: Fixed downlink support for SX1301AP2 reference design: soft reset of the
  FPGA was missing for proper IQ inversion configuration.
• HAL: Added support for several versions of FPGA (currently v18 and v19)
• HAL: Reduced radio TX PLL bandwidth to reduce the noise level.
• HAL: Change cs_change usage policy in SPI module to let the driver handle the chip
  select.
• util_tx_test: Added FSK support and added minimal TX gain LUT.
• util_spectral_scan: Removed FPGA soft reset, now done by the HAL.
• util_tx_continous: reworked to use HAL functions instead of 'manual' config,
  and use same SX1301 calibration firmware as the HAL.
• Updated all makefiles to handle the creation of obj directory when necessary.