arm64: zynqmp: Start TPM automatically via preboot on Kria

SOMs have HW tpm but previous stages won't start it that's why start it at
U-Boot which will also provide access to random generator and it's usage
with KASLR.

Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/dffd2ee4cf2844832ebbdabefca0099cd2629ccc.1704980933.git.michal.simek@amd.com
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