spi/pl022: move probe call to subsys_initcall()

The PL022 SPI bus is sometimes used for early stuff like
regulators that need to be present at module_init() time, so
we move this to a subsys_initcall().

Signed-off-by: Linus Walleij <linus.walleij@stericsson.com>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
diff --git a/drivers/spi/amba-pl022.c b/drivers/spi/amba-pl022.c
index 80613ab..4c37c4e2 100644
--- a/drivers/spi/amba-pl022.c
+++ b/drivers/spi/amba-pl022.c
@@ -1983,7 +1983,7 @@
 	return amba_driver_register(&pl022_driver);
 }
 
-module_init(pl022_init);
+subsys_initcall(pl022_init);
 
 static void __exit pl022_exit(void)
 {