PIC32MZ: Add missing call to initialize peripheral clocking. From Kristopher Tate

arch/mips/src/pic32mz/pic32mz-lowinit.c

@@ -398,10 +398,12 @@ void pic32mz_lowinit(void)
 
   /* Enable caching in KSEG0 */
 
-  pic32mz_k0cache();;
+  pic32mz_k0cache();
 
   /* Configure peripheral clocking */
 
+  pic32mz_pbclk();
+
   /* Initialize a console (probably a serial console) */
 
   pic32mz_consoleinit();