ARM: imx_v6_v7_defconfig: Select HCIUART_H4

The old warp board revision had hardware issues that prevented
the RTS/CTS lines to work with the Bluetooth module.

Tha latest rev1.12 fixes this problem, so now we should better use
CONFIG_BT_HCIUART_H4 instead, as it provides a better throughput than
the CONFIG_BT_HCIUART_3WIRE option.
Suggested-by: Arthur Lambert <arthur@dreem.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>

arch/arm/configs/imx_v6_v7_defconfig

@@ -76,7 +76,7 @@ CONFIG_CAN_FLEXCAN=y
 CONFIG_BT=y
 CONFIG_BT_HCIUART=y
 CONFIG_BT_HCIUART_LL=y
-CONFIG_BT_HCIUART_3WIRE=y
+CONFIG_BT_HCIUART_H4=y
 CONFIG_CFG80211=y
 CONFIG_MAC80211=y
 CONFIG_RFKILL=y