ARM: shmobile: Enable USB [EO]HCI HCD support in shmobile_defconfig

The USB [EO]HCI HCD drivers provide USB host support for Renesas
R-Car Gen2 platforms. To increase hardware support enable the driver in the
shmobile_defconfig multiplatform configuration.

Acked-by: Magnus Damm <damm@opensource.se>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>