MIPS: ath25: clean up non-kernel-doc comment warning

Don't use "/**" kernel-doc notation for comments that are not in
kernel-doc format.

Eliminates one warning:

arch/mips/pci/pci-ar2315.c:6: warning: This comment starts with
'/**', but isn't a kernel-doc comment. Refer
Documentation/doc-guide/kernel-doc.rst
* Both AR2315 and AR2316 chips have PCI interface unit, which supports DMA

Signed-off-by: Randy Dunlap <[e-mail]>
Reported-by: kernel test robot <[e-mail]>
Cc: Aditya Srivastava <[e-mail]>
Cc: Thomas Bogendoerfer <[e-mail]>
Cc: [e-mail]
Cc: Sergey Ryazanov <[e-mail]>
Acked-by: Sergey Ryazanov <[e-mail]>
Signed-off-by: Thomas Bogendoerfer <[e-mail]>

arch/mips/pci/pci-ar2315.c

···
 /*
  */
 
-/**
+/*
  * Both AR2315 and AR2316 chips have PCI interface unit, which supports DMA
  * and interrupt. PCI interface supports MMIO access method, but does not
  * seem to support I/O ports.