UAPI: ioctls: Remove header dependency on termbits.h

In commit 8150b539 ("serial: msm_geni_serial:Add
snapshot of serial UART driver") false header dependency is
added in ioctls.h to termbits.h. This causes redefinition
errors with libc headers. Fix this by removing it.

Change-Id: Id6ae30f8416e6a5fccaf2fe78f548b3877a45285
Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org>