ARM: dts: msm: Increase proxy timeout for venus

The proxy_voting operation has been shifted to be done a bit
earlier. Hence, increase the proxy timeout for venus to 5 seconds
instead of 2 seconds.

Change-Id: I341b2d5b22d492b307d69a4f816b5784e51a0321
Signed-off-by: Deepak Katragadda <dkatraga@codeaurora.org>