ahci: sata: add support for exynos5440 sata

This patch adds the compatible string of the exynos5440 sata controller
compliant with the ahci 1.3 and sata 3.0 specification.

changes in v2:
		changed the compatible string by adding the actual IP
owners name instead of the SoC vendor name.

Signed-off-by: Girish K S <ks.giri@samsung.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
diff --git a/drivers/ata/ahci_platform.c b/drivers/ata/ahci_platform.c
index 7a8a284..2daaee0 100644
--- a/drivers/ata/ahci_platform.c
+++ b/drivers/ata/ahci_platform.c
@@ -327,6 +327,7 @@
 
 static const struct of_device_id ahci_of_match[] = {
 	{ .compatible = "snps,spear-ahci", },
+	{ .compatible = "snps,exynos5440-ahci", },
 	{},
 };
 MODULE_DEVICE_TABLE(of, ahci_of_match);