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smcf: Check MODE_STAT after setting MODE_REQ

Wen Ping Teh requested to merge wp/configure-modereq-individually into main

This patch introduces a check in the MGI module to ensure MODE_REQ registers is set successfully. From the RTL design, MODE_REQ registers should be configured individually and the register has to be processed before setting the next MODE_REQ register. This is done by checking the MODE_STAT register and a timeout is added to prevent indefinite wait.

Signed-off-by: Wen Ping Teh wenping.teh@arm.com Change-Id: I6fe0469dea9a68f6c7374596b5566cdafeb17fcb

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