Staging: HTC Dream: add rpcrouter driver

rpcrouter code is neccessarry for communication with QDSP and thus
many hardware components on HTC Dream, including camera hardware.


Cc: Brian Swetland <swetland@google.com>
Cc: Iliyan Malchev <ibm@android.com>
Cc: San Mehat <san@android.com>
Signed-off-by: Pavel Machek <pavel@ucw.cz>