ARM: dts: msm: Change prng dtsi config from 32 bit to 64 bits

Set PRNG TPDM to 64 bits for entropy collection to work.

Acked-by : Yin Ling Liong <yliong@qti.qualcomm.com>
Change-Id: I3857164e8bc00fd531083b9c0354d91a895b3f63