ARM: configs: omap2plus_defconfig: enable dwc3 and dependencies

DWC3 enables USB3 functionality for OMAP5 boards,
it's safe to enable those drivers in omap2plus_defconfig.

Signed-off-by: Felipe Balbi <balbi@ti.com>
Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Benoit Cousson <bcousson@baylibre.com>
[tony@atomide.com: updated against other defconfig changes]
Signed-off-by: Tony Lindgren <tony@atomide.com>