yuga: support mass storage USB modes

This allows apps like DriveDroid to use the standard Android interface
to configure mass storage mode. id's were obtained from the Sony Xperia
Developer World lagan repository on Github.

Change-Id: Ica66e64f8ce07e04ea954dded5396027109ee9ff
yuga: allow external SD to be mounted as Mass Storage volume

Change-Id: I3758074332d46ff9b61e5e30ac9fb6db1b9afc53
Signed-off-by: Arnav Gupta <championswimmer@aokp.co>