Update submodules on '5.6' in qt5

Change-Id: I73b32ee6ef5a643c78bb297230fb675a5a3dd64f
Reviewed-by: Liang Qi <liang.qi@qt.io>

diff --git a/qtbase b/qtbase
index ac38452..3691f7c 160000 (submodule)
--- a/qtbase
+++ b/qtbase
@@ -1 +1 @@
-Subproject commit ac384524c8fa6b19153811e2eaf6dac6b911f930
+Subproject commit 3691f7ca0c7117f18ea38ca3950ee9a8a91a53c8

diff --git a/qtdeclarative b/qtdeclarative
index a3fe91b..5ffd0d8 160000 (submodule)
--- a/qtdeclarative
+++ b/qtdeclarative
@@ -1 +1 @@
-Subproject commit a3fe91ba463fcd27d6e0a69b66bc389bd6470c46
+Subproject commit 5ffd0d8be35cea57acbf1e8d7a740d3fab5cbe43

diff --git a/qtdoc b/qtdoc
index 771e871..120479a 160000 (submodule)
--- a/qtdoc
+++ b/qtdoc
@@ -1 +1 @@
-Subproject commit 771e871aef5aac605819d1ee5242aa0b751872bf
+Subproject commit 120479a3275b4c7844613777525bd3b1b48eefed

diff --git a/qtmultimedia b/qtmultimedia
index 3d9ef4d..4430f5e 160000 (submodule)
--- a/qtmultimedia
+++ b/qtmultimedia
@@ -1 +1 @@
-Subproject commit 3d9ef4d41718adc9a9099964eb4f964d1d3b63df
+Subproject commit 4430f5ebd6f593e080a6ac859e76eed5354b704f

diff --git a/qtwebkit b/qtwebkit
index 7c3f338..d542341 160000 (submodule)
--- a/qtwebkit
+++ b/qtwebkit
@@ -1 +1 @@
-Subproject commit 7c3f338f042acebe7cf56de319bfb26a16d1aca3
+Subproject commit d542341492a0c18058b3f03008ea8916d84ccef3