powerpc/kexec: fix minor typo

Function name in the descriptor was not correct.

Reported-by: kernel test robot <[e-mail]>
Closes: https://lore.kernel.org/oe-kbuild-all/[e-mail]/
Signed-off-by: Laurent Dufour <[e-mail]>
Signed-off-by: Michael Ellerman <[e-mail]>
Link: https://msgid.link/[e-mail]

arch/powerpc/kexec/file_load_64.c

···
 }
 
 /**
- * get_cpu_node_size - Compute the size of a CPU node in the FDT.
- *                     This should be done only once and the value is stored in
- *                     a static variable.
+ * cpu_node_size - Compute the size of a CPU node in the FDT.
+ *                 This should be done only once and the value is stored in
+ *                 a static variable.
  * Returns the max size of a CPU node in the FDT.
  */
 static unsigned int cpu_node_size(void)