microblaze: Add static qualifiers

Adding static to internal variables and functions.

Sparse warnings:
arch/microblaze/kernel/prom.c:55:6: warning:
	symbol 'stdout' was not declared. Should it be static?
arch/microblaze/kernel/prom.c:57:12: warning:
	symbol 'early_init_dt_scan_chosen_serial' was not declared. Should it be static?
  CC      arch/microblaze/kernel/prom.o
arch/microblaze/kernel/intc.c:102:5: warning:
	symbol 'xintc_map' was not declared. Should it be static?
  CC      arch/microblaze/kernel/intc.o

Signed-off-by: Michal Simek <michal.simek@xilinx.com>

arch/microblaze/kernel/intc.c

@@ -99,7 +99,7 @@ unsigned int get_irq(void)
 	return irq;
 }
 
-int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
+static int xintc_map(struct irq_domain *d, unsigned int irq, irq_hw_number_t hw)
 {
 	u32 intr_mask = (u32)d->host_data;
 

arch/microblaze/kernel/prom.c

@@ -52,9 +52,9 @@ void * __init early_init_dt_alloc_memory_arch(u64 size, u64 align)
 }
 
 #ifdef CONFIG_EARLY_PRINTK
-char *stdout;
+static char *stdout;
 
-int __init early_init_dt_scan_chosen_serial(unsigned long node,
+static int __init early_init_dt_scan_chosen_serial(unsigned long node,
 				const char *uname, int depth, void *data)
 {
 	unsigned long l;