arm64: dts: qcom: msm8996: Add mpp and lpg blocks

arm64: dts: qcom: msm8996: Add mpp and lpg blocks

BugLink: http://bugs.launchpad.net/bugs/1763040
The pm8994 contains a 6 LPG channels. The pmi8994 contains 4 MPP
channels and a 4 channel LPG, with TRILED and LUT blocks.

Add nodes for these blocks.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Ramon Fried <rfried@codeaurora.org>
(cherry picked from commit 8b261837dedafed1efabef5b77e5835f6359ac64
http://git.linaro.org/landing-teams/working/qualcomm/kernel.git release/qcomlt-4.14)
Signed-off-by: Paolo Pisati <paolo.pisati@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>
Signed-off-by: Thadeu Lima de Souza Cascardo <cascardo@canonical.com>