ARM: dts: msm: Add qprng device tree data for msmthorium

Add random number generator device tree data to dtsi file by
adding msm-rng device node with all the necessary parameters,
to enable the prng driver on msmthorium.

Change-Id: Iacd34fba4f42a1000324d72afaa441ce25ec5213
Signed-off-by: Mallikarjuna Reddy Amireddy <mamire@codeaurora.org>