Fix crash on boot

There is a race condition where the sysfs-vsync thread accesses a value
(in particular a function ptr) that may not have been set yet as this
is done externally.

Change-Id: If1afb1533344e994398b9b6f5bd3dfb125313416
xmm626x: Update libril to v9 [1/2]

Change-Id: Ia8267f3757b45089c969c79668aa6734d18187e0
Merge "xmm626x: Update libril to v9 [1/2]" into kk4.4
Revert "xmm626x: Update libril to v9 [1/2]"

This reverts commit 17861eefd9d8ff4a97912313f4363ce2e2354051.

Change-Id: Ia809f21e720fddf58425e2dec6ea298a7e727cf6