TDA4VM: Why the HF osc(OSC1) choose the 22.5792Mhz in the TDA4VM EVM board? (ref number Y1 in the EVM board)

OSC1 input is not required for the processor to function, but is provided as an optional 2nd clock input.  For our EVM - the OSC1 clock is used to generate audio sampling frequencies for the on-board audio codec(s).