nimble/phy/nrf53: Add PA/LNA support
nimble/phy/nrf53: Add PA/LNA support

This is basically port of 9ef71450 to nRF53 and DPPI.

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble