fix(plat/arm): exclude FF-A v1.1 secure interrupt tests

Excluded tests are not run but are still built. Specify TWDOG
parameters for Arm Reference platforms to avoid below compilation
errors.

This is only a temporary fix. These platforms do not have SP805 IP.
They implement Generic Watchdog IP.

tftf/tests/runtime_services/secure_service/test_ffa_secure_interrupts.c:29:50: error: 'IRQ_TWDOG_INTID' undeclared (first use in this function)
   29 |  ret_values = cactus_interrupt_cmd(source, dest, IRQ_TWDOG_INTID,
      |                                                  ^~~~~~~~~~~~~~~
tftf/tests/runtime_services/secure_service/test_ffa_secure_interrupts.c:29:50: note: each undeclared identifier is reported only once for each function it appears in
make: *** [Makefile:512: build/rdn1edge/debug/tftf/test_ffa_secure_interrupts.o] Error 1

drivers/arm/sp805/sp805.c: In function 'sp805_twdog_start':
drivers/arm/sp805/sp805.c:172:20: error: 'SP805_TWDOG_BASE' undeclared (first use in this function); did you mean 'SP805_WDOG_BASE'?
  172 |  sp805_wdog_start_(SP805_TWDOG_BASE, wdog_cycles);
      |                    ^~~~~~~~~~~~~~~~
      |                    SP805_WDOG_BASE
drivers/arm/sp805/sp805.c:172:20: note: each undeclared identifier is reported only once for each function it appears in

Signed-off-by: Madhukar Pappireddy <madhukar.pappireddy@arm.com>
Change-Id: Ic1e549716dd6aea4d794b964a76c402bf71a6179
4 files changed