I will answer my post in case this benefits someone else.
Incorrect value for CPOL & CPHA does not disable SCLK.
CPOL (Clock Polarity)= 0 & CPHA (Clock Phase)= 1 works for my program.
AFE5801 ignores SCLK & SDATA when SEN is high. Hence, we need to check SEN.
Thanks,
Mohit Kapur