ARM: shmobile: mackerel: defconfig update

This patch enables following devices by default
 - I2C
 - HDMI
 - USB (host/gadget)
 - ALSA (FSI)
 - DMAEngine

Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@renesas.com>
Signed-off-by: Simon Horman <horms@verge.net.au>