plat-imx: implement PL310 SMC protocol

When Windows runs in normal world, it expects the PL310 to be initially
disabled, and then invokes SMCs to enable it.
When CFG_PL310_SIP_PROTOCOL=y, the L2 cac

plat-imx: implement PL310 SMC protocol

When Windows runs in normal world, it expects the PL310 to be initially
disabled, and then invokes SMCs to enable it.
When CFG_PL310_SIP_PROTOCOL=y, the L2 cache will be left untouched until
the OS enables it.

Acked-by: Etienne Carriere <etienne.carriere@linaro.org>
Reviewed-by: Peng Fan <peng.fan@nxp.com>
Signed-off-by: Jordan Rhee <jordanrh@microsoft.com>
Tested-by: Jordan Rhee <jordanrh@microsoft.com>

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