docs: Remove reference to removed CBE_CPUFREQ_SPU_GOVERNOR
Remove a reference to CBE_CPUFREQ_SPU_GOVERNOR which has been removed.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20241218105523.416573-20-mpe@ellerman.id.au
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