pta: bcm: Add HW RNG PTA

Add PTA for hardware random number generator.
PTA Reads the random number from the RNG FIFO and passes to
user application.

Signed-off-by: Bharat Kumar Reddy Gooty <bharat.

pta: bcm: Add HW RNG PTA

Add PTA for hardware random number generator.
PTA Reads the random number from the RNG FIFO and passes to
user application.

Signed-off-by: Bharat Kumar Reddy Gooty <bharat.gooty@broadcom.com>
Signed-off-by: Sheetal Tigadoli <sheetal.tigadoli@broadcom.com>
Reviewed-by: Jerome Forissier <jerome@forissier.org>

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