test(rme): check various SIMD state preserved across NS/RL switch

Thie test case verifies whether various SIMD related registers like
Q[0-31], FPCR, FPSR, Z[0-31], P[0-15], FFR are preserved by RMM during
world switch between NS world and Realm world.

Randomly verify FPU registers or SVE registers if the system supports
SVE. Within SVE, randomly configure SVE vector length.

This testcase runs on below configs:
* with SVE
* without SVE

Signed-off-by: Arunachalam Ganapathy <arunachalam.ganapathy@arm.com>
Change-Id: I3fc755f75bdcdc8c24af0440d8a5f094beafca73
diff --git a/realm/include/realm_tests.h b/realm/include/realm_tests.h
index b73cc3b..1351415 100644
--- a/realm/include/realm_tests.h
+++ b/realm/include/realm_tests.h
@@ -20,6 +20,7 @@
 bool test_realm_sve_probe_vl(void);
 bool test_realm_sve_ops(void);
 bool test_realm_sve_fill_regs(void);
+bool test_realm_sve_cmp_regs(void);
 bool test_realm_sve_undef_abort(void);
 
 #endif /* REALM_TESTS_H */