[PATCH v3] ahci: qoriq: fixed using uninitialized variable warnings

[<Yuantian.Tang@freescale.com>]

From: Tang Yuantian <Yuantian.Tang@freescale.com>

kbuild test robot reports the warnings:
drivers/ata/ahci_qoriq.c: In function 'ahci_qoriq_hardreset':
>> include/asm-generic/io.h:163:2: warning: 'px_is' may be used
>> uninitialized in this function [-Wuninitialized]
drivers/ata/ahci_qoriq.c:70:14: note: 'px_is' was declared here
>> include/asm-generic/io.h:163:2: warning: 'px_cmd' may be used
>> uninitialized in this function [-Wuninitialized]
drivers/ata/ahci_qoriq.c:70:6: note: 'px_cmd' was declared here

This is caused by openrisc arch's compiler. This driver is for
QorIQ ARM platforms. So add the dependency on ARM to remove
these warnings.

Signed-off-by: Tang Yuantian <Yuantian.Tang@freescale.com>
---
v3:
	- fix it by in a new way
v2:
	- try another way to fix the warnings
	- remove clean up code

 drivers/ata/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ata/Kconfig b/drivers/ata/Kconfig
index 6aaa3f8..a830344 100644
--- a/drivers/ata/Kconfig
+++ b/drivers/ata/Kconfig
@@ -177,7 +177,7 @@ config AHCI_XGENE
 
 config AHCI_QORIQ
 	tristate "Freescale QorIQ AHCI SATA support"
-	depends on OF
+	depends on OF && ARM
 	help
 	  This option enables support for the Freescale QorIQ AHCI SoC's
 	  onboard AHCI SATA.
-- 
2.1.0.27.g96db324