parisc: add missing __init annotation

compilation failed with:

MODPOST vmlinux.o
WARNING: vmlinux.o(.text.unlikely+0xa0c): Section mismatch in reference from the function walk_lower_bus() to the function .init.text:walk_native_bus() The function walk_lower_bus() references
the function __init walk_native_bus().
This is often because walk_lower_bus lacks a __init
annotation or the annotation of walk_native_bus is wrong.

FATAL: modpost: Section mismatches detected.
Set CONFIG_SECTION_MISMATCH_WARN_ONLY=y to allow them.
make[2]: *** [/home/svens/linux/parisc-linux/src/scripts/Makefile.modpost:64: __modpost] Error 1 make[1]: *** [/home/svens/linux/parisc-linux/src/Makefile:1077: vmlinux] Error 2 make[1]: Leaving directory '/home/svens/linux/parisc-linux/build'
make: *** [Makefile:179: sub-make] Error 2

---
 arch/parisc/kernel/drivers.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

index 3b330e58a4f0..a6c9f49c6612 100644
@@ -810,7 +810,7 @@ EXPORT_SYMBOL(device_to_hwpath);
 static void walk_native_bus(unsigned long io_io_low, unsigned long io_io_high,
                             struct device *parent);
 
-static void walk_lower_bus(struct parisc_device *dev)
+static void __init walk_lower_bus(struct parisc_device *dev)
 {
 	unsigned long io_io_low, io_io_high;
 

2.24.0