plat-k3: drivers: Add TRNG driver support in AM62L

AM62L contains the EIP76D TRNG IP which was also present in the previous
K3 devices inside the SA2UL accelerator, so the same driver is being
re-us

plat-k3: drivers: Add TRNG driver support in AM62L

AM62L contains the EIP76D TRNG IP which was also present in the previous
K3 devices inside the SA2UL accelerator, so the same driver is being
re-used here. But the AM62L does not have SA2UL. The SoC specific
configurations are being set here for AM62L for enabling TRNG.

Signed-off-by: T Pratham <t-pratham@ti.com>
Reviewed-by: Manorit Chawdhry <m-chawdhry@ti.com>
Acked-by: Jens Wiklander <jens.wiklander@linaro.org>

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