rdn2/run_model: update TZC_BYPASS_PARAM

Until 11.15 version, RD-N2 FVP had `mem` component which instantiated
`n` number of TZC's statistically and controlled the access to number of
regions required for a particular TZC during runtime. Starting from
11.16 version, the `mem` component is removed and the number of regions
parameter (`tzcN.num_region`) for a particular TZC has been removed as a
model parameter and is configured statically by the model.

Signed-off-by: Vijayenthiran Subramaniam <vijayenthiran.subramaniam@arm.com>
Change-Id: Ic92a94873dd3ea3546b9b8a725e8ce327742f7bc