ARM: dts: msm: Add camera csiphy version for 8940

Csiphy version support with nodes specific for 8940.
Front camera fails as it is using the phy version
of 8937. Added support for correct phy version.

CRs-Fixed: 1022518
Change-Id: Idfb5f7bd12889a86035a9d072e076ca696e69448
Signed-off-by: Shankar Ravi <rshankar@codeaurora.org>