[trusty][ipc] Update IPC related defs

 Add declaration of handle_t - uint32_t opaque value to represent handle
 Add #define INVALID_IPC_HANDLE to represent invalid ipc handle
 Cleanup definitions for structures shared with kernel
 Remove unused definitions

Change-Id: Iaaf5973a0bbfff131413ba129e03dea1e382e9e3
1 file changed
tree: 4028574243a26be059e662566596afd9a97880d2
  1. include/
  2. lib/