apps/examples/rdp : Fix error in rdp demo after TZ restructuring
apps/examples/rdp : Fix error in rdp demo after TZ restructuring

TZ secure context operations have been restructured. The global
variable tz_memory has been removed. Here, we fix the compilation
error caused by using this variabled in rdp_demo example.

Signed-off-by: Kishore S N <33058dcca7ce956a91a61ef5ae8fb790ece75b5f@samsung.com>

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