arm/dt: msm8974: add a new i2c node on blsp1 qup1

Add configuration of blsp1 qup1 as i2c.
The node is disabled by default and should be enabled in board specific.

Change-Id: Ieb7d79867048612fbf6a10a5dd4e5f73321ed170
Signed-off-by: Asaf Penso <apenso@codeaurora.org>