ARM: keystone: config: fix build warning when CONFIG_DMADEVICES is not set

Drop automatic selection of TI_EDMA from Keystone Kconfig file,
as it produces build warning in case if CONFIG_DMADEVICES is not set:

warning: (ARCH_KEYSTONE) selects TI_EDMA which has unmet direct dependencies (DMADEVICES && (ARCH_DAVINCI || ARCH_OMAP || ARCH_KEYSTONE))

Instead enable TI EDMA support from defconfig.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
diff --git a/arch/arm/configs/keystone_defconfig b/arch/arm/configs/keystone_defconfig
index a018244..4582e16 100644
--- a/arch/arm/configs/keystone_defconfig
+++ b/arch/arm/configs/keystone_defconfig
@@ -142,6 +142,7 @@
 CONFIG_USB_DWC3_VERBOSE=y
 CONFIG_KEYSTONE_USB_PHY=y
 CONFIG_DMADEVICES=y
+CONFIG_TI_EDMA=y
 CONFIG_COMMON_CLK_DEBUG=y
 CONFIG_MEMORY=y
 CONFIG_EXT4_FS=y