ARM: shmobile: bockw: enable USB in defconfig

Enable USB platform EHCI/OHCI and common PHY drivers in 'bockw_defconfig'.
Enable USB storage driver and SCSI disk driver that it needs as well...

Signed-off-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: Simon Horman <horms+renesas@verge.net.au>