[MIPS] PCI: Make the pcibios_max_latency variable static

The pcibios_max_latency variable is needlessly defined global, and this
patch makes it static.

Build-tested using malta_defconfig.

Signed-off-by: Dmitri Vorobiev <[e-mail]>
Signed-off-by: Ralf Baechle <[e-mail]>

arch/mips/pci/pci.c

···
  *  If we set up a device for bus mastering, we need to check the latency
  *  timer as certain crappy BIOSes forget to set it properly.
  */
-unsigned int pcibios_max_latency = 255;
+static unsigned int pcibios_max_latency = 255;
 
 void pcibios_set_master(struct pci_dev *dev)
 {

include/asm-mips/pci.h

···
 }
 
 extern int pci_probe_only;
-extern unsigned int pcibios_max_latency;
 
 #endif /* _ASM_PCI_H */