product: allow platforms to specify valid PID/CID registers

For the supported platforms, allow the module configuration data to
specify the valid set of PID/CID registers to be compared. The valid
set of registers are represented as a bitmap.

Signed-off-by: Thomas Abraham <thomas.abraham@arm.com>
Change-Id: Iecb9ef7dd9c70b1b6d71fcd89bb211118d60d9af