uapi: asm-generic: ioctls: Include the termbits.h header file

Include the required header file and refer to the data structures defined
in that header file.

Change-Id: I4a9d49d6818cda292f6c1aad9af2ea0925431080
Signed-off-by: Karthikeyan Ramasubramanian <kramasub@codeaurora.org>