phy: kona2: use 'select GENERIC_PHY' in Kconfig

All other phy drivers use 'select', while this one is
the only one to use 'depends on'. This is not a bug, just
slightly inconsistent, so let's change it to do things the
same way as everyone else.

We may also want to turn GENERIC_PHY into a silent option
that only ever gets turned on if another driver needs it.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Kishon Vijay Abraham I <kishon@ti.com>
Cc: Matt Porter <mporter@linaro.org>
Cc: Felipe Balbi <balbi@ti.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig
index 4906c27..071b763 100644
--- a/drivers/phy/Kconfig
+++ b/drivers/phy/Kconfig
@@ -89,8 +89,8 @@
 
 config BCM_KONA_USB2_PHY
 	tristate "Broadcom Kona USB2 PHY Driver"
-	depends on GENERIC_PHY
 	depends on HAS_IOMEM
+	select GENERIC_PHY
 	help
 	  Enable this to support the Broadcom Kona USB 2.0 PHY.