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This patch passes the boot parameters, provided by the previous
bootloader, to the Trusted OS via X0, X1 and X2.

Original change by: Wayne Lin <wlin@nvidia.com>

Change-Id: I2039612a8a8226158babfd505ce8c31c4212319c
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>