rockchip: evb-rk3229: add README file for OP-TEE support

Detail of step by step to bring up the board with OP-TEE support.

Change-Id: If3156fa3fb3ede6270f871dcf0e518aced202443
Signed-off-by: Kever

rockchip: evb-rk3229: add README file for OP-TEE support

Detail of step by step to bring up the board with OP-TEE support.

Change-Id: If3156fa3fb3ede6270f871dcf0e518aced202443
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

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