soc: qcom: glink: Use reinit_completion() instead of INIT_COMPLETION()

Currently, G-Link uses the INIT_COMPLETION() call. This has been
deprecated in the 3.13 kernel and replaced with reinit_completion().

Define a macro that will make the G-Link code compatible with both
the 3.10 and 3.14 kernels.

Change-Id: Ib20ff5085adb58b1f257358244c0f3298cf5cadd
Signed-off-by: Steven Cahail <scahail@codeaurora.org>