ARM: omap2plus_defconfig: Enable MDM6600 USB PHY

This allows droid 4 USB modem to work.
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/configs/omap2plus_defconfig

@@ -500,6 +500,7 @@ CONFIG_PWM_TIEHRPWM=m
 CONFIG_PWM_TWL=m
 CONFIG_PWM_TWL_LED=m
 CONFIG_PHY_CPCAP_USB=m
+CONFIG_PHY_MAPPHONE_MDM6600=m
 CONFIG_PHY_DM816X_USB=m
 CONFIG_OMAP_USB2=m
 CONFIG_TI_PIPE3=y