arm64: dts: Add msm8939 SoC

Add msm8939 a derivative SoC of msm8916. This SoC contains a number of key
differences to msm8916.

- big.LITTLE Octa Core - quad 1.5GHz + quad 1.0GHz
- DRAM 1x800 LPDDR3
- Camera 4+4 lane CSI
- Venus @ 1080p60 HEVC
- DSI x 2
- Adreno A405
- WiFi wcn3660/wcn3680b 802.11ac

Co-developed-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
Co-developed-by: Jun Nie <jun.nie@linaro.org>
Signed-off-by: Jun Nie <jun.nie@linaro.org>
Co-developed-by: Benjamin Li <benl@squareup.com>
Signed-off-by: Benjamin Li <benl@squareup.com>
Co-developed-by: James Willcox <jwillcox@squareup.com>
Signed-off-by: James Willcox <jwillcox@squareup.com>
Co-developed-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Co-developed-by: Joseph Gates <jgates@squareup.com>
Signed-off-by: Joseph Gates <jgates@squareup.com>
Co-developed-by: Max Chen <mchen@squareup.com>
Signed-off-by: Max Chen <mchen@squareup.com>
Co-developed-by: Zac Crosby <zac@squareup.com>
Signed-off-by: Zac Crosby <zac@squareup.com>
Co-developed-by: Vincent Knecht <vincent.knecht@mailoo.org>
Signed-off-by: Vincent Knecht <vincent.knecht@mailoo.org>
Signed-off-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>