mdss: mhl3: Add driver for MHL Transmitter

Code drop from https://github.com/siliconimageinc/sii8620


taken from commit 20b4c581d705cffce422bc79c2bacf7ed5363beb

"Posting driver 1.03 release candidate.

Version 1.03.19

Signed-off-by: Mikhail Amchislavsky <Mikhail.Amchislavsky@siliconimage.com&gt;">

Adding driver for SiI 8620 MHL transmitter.
Integrated the files into drivers/video/msm/mdss/mhl3/.

Removed unnecessary files:
apq8074_kernel_update/apq8074-dragonboard.dtsi
apq8074_kernel_update/board-8974-gpiomux.c
apq8074_kernel_update/msm8974.dtsi
apq8074_kernel_update/sii6031/msm_otg.c
apq_build.sh
build
build_num.txt
clean

Moved files relating to SiI 6031:
apq8074_kernel_update/sii6031/msm_otg.c
apq8074_kernel_update/sii6031/si_6031_switch.h
apq8074_kernel_update/sii6031/sii_6031/Kconfig
apq8074_kernel_update/sii6031/sii_6031/Makefile
apq8074_kernel_update/sii6031/sii_6031/si_6031_switch.c
into drivers/video/msm/mdss/mhl3/sii6031/.

Change-Id: I29adf3bd4a02406bd9b47c0727d4093cdea94496
Signed-off-by: Casey Piper <cpiper@codeaurora.org>