I believe the reason for the multiple clocks is that they divide more easily to different base clocks.
44.1 kHz is Redbook/CD standard while higher resolution starts at 48 kHz.
49.152 MHz is 1024 x 48 kHz.
45.1584 MHz is 1024 x 44.1 kHz.
So the high speed connection would be used at 48, 96, etc. while the lower clock rate is for 44.1, 88,2, etc.