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[Why] The I2C memory blocks should be powered down when they are not in use. This will reduce power consumption. [How] 1. Write to I2C_LIGHT_SLEEP_FORCE to put memory in light sleep when released 2. Added a debug option to allow this behaviour to be turned off Signed-off-by: Jacky Liao <ziyu.liao@amd.com> Acked-by: Bindu Ramamurthy <bindu.r@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com>