microblaze: Add debug message about enabling interrupts

Add one more debug message about enabling global interrupts.

Signed-off-by: Michal Simek <michal.simek@xilinx.com>
diff --git a/arch/microblaze/cpu/interrupts.c b/arch/microblaze/cpu/interrupts.c
index 771bbd0..f66ec69 100644
--- a/arch/microblaze/cpu/interrupts.c
+++ b/arch/microblaze/cpu/interrupts.c
@@ -16,6 +16,7 @@
 
 void enable_interrupts(void)
 {
+	debug("Enable interrupts for the whole CPU\n");
 	MSRSET(0x2);
 }