ARM: multi_v7_defconfig: enable useful configurations for Vybrid

Enable configuration options useful for Vybrid:
- NFC NAND driver
- USB dual-role controller (and Chipidea Gadget support)
- Built-in EDMA DMA driver (to be available at LPUART probe)
- Vybrid ADC driver
- IIO hwmon support (used in i.MX 23/28, patch pending for Vybrid)

Signed-off-by: Stefan Agner <stefan@agner.ch>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>