Platforms: Put timer driver to SPRT for IRQ testing only

In a previous change 362817f1713321203eb3147801e0711369060687
the timer driver was put into SPRT by default.
That change was actually for testing purpose only.

This patch puts timer driver to SPRT only when IRQ testing is enabled.

Change-Id: I8d7629d30b56f3982b041bbe8edf0c89a685f4bc
Signed-off-by: Kevin Peng <kevin.peng@arm.com>
2 files changed