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Hi GardenGreenSum,
SRDY and MRDY signals are needed, you can't use SPI interface without them.
In the default SPI interface configuration available using RF4CE RNP NWK, they are mapped to GPIOs, namely on P0.3 (MRDY, input to CC253x) and P0.4 (SRDY, output from CC253x). Those lines are available respectively on the EVM headers, namely P1.9 and P1.3 of the CC253x EVM interface headers. Please use those lines to connect MRDY and SRDY signals coming out of host GPIOs (please note MRDY MUST be different from SPI SS at the input of CC253x but can be the same line coming out of host).
Are you talking about this EVM or the target board? Now on RemoTI target board (which is used to convert USB-to-serial) SPI interface is also available as well as P0.3 and P0.4 (namely UART Tx and UART-CTS on J4 interface).
I hope this helps.
Thanks,
TheDarkSide