coresight: byte-cntr: Add snapshot of Byte cntr driver

This is a snapshot of the coresight-cti driver as of msm-4.14
commit '7d42028b99d32ad6ec82aa429378fba0280a1c4a'.(byte-cntr: Read 64bit
rwp TMC RWP has two 32bit registers which combine to one 64bit register.
Read correct RWP register in byte counter driver).Add support for a
streaming interface for TMC ETR to allow for continuous log collection to
secondary storage. An interrupt based mechanism is used to stream out the
data from the device. The streaming interface cannot be used in
conjunction with the traditional ETR read operation.

Change-Id: I9a78107273f295ecb219f89ec728aa7b9eea27e0
Signed-off-by: Satyajit Desai <sadesai@codeaurora.org>
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>
Signed-off-by: Mulu He <muluhe@codeaurora.org>