I didn't find it in 001-92739_PSoC_4_BLE_Registers_TRM.pdf either.
SSN you can route them to other pins if you want. 3.2 and 3.3 are not fixed to prove this just uncheck the lock box in the pins section of Design wide resources. Information about the Cy definitions are in the API document you can get to this by right clicking the BLE component and selecting API documentation.
The macro #define CYREG_RADIO_TX_RX_MUX_REGISTER 0x40030008 in the project. I believe this is the register in radio module. I would like to know the register field details which is not seen in API documentation as well.