satman main & si549: add WRPLL select_recovered_clock
satman main & si549: add helper si549 setup
si549: add tag collector to process gtx & main tags
si549: add frequency counter to set BASE_ADPLL
si549: add set_adpll for main & helper PLL
si549: add main & helper PLL
FIQ & si549: add handler for gtx & main tags FIQ
io_expander: set CLK_SEL pin to output when si549 is used
satman main: drive CLK_SEL to true when si549 is used
satman main & si549: add main DCXO setup
si549: add bit bang i2c
si549: add si549 programming & main setup