KVM: arm64: selftests: Consider all 7 possible levels of cache

In test_clidr() if an empty cache level is not found then the TEST_ASSERT
will not fire. Fix this by considering all 7 possible levels when iterating
through the hierarchy. Found by inspection.

Signed-off-by: Ben Horgan <[e-mail]>
Acked-by: Marc Zyngier <[e-mail]>
Acked-by: Oliver Upton <[e-mail]>
Signed-off-by: Catalin Marinas <[e-mail]>

tools/testing/selftests/kvm/arm64/set_id_regs.c

···
 	clidr = vcpu_get_reg(vcpu, KVM_ARM64_SYS_REG(SYS_CLIDR_EL1));
 
 	/* find the first empty level in the cache hierarchy */
-	for (level = 1; level < 7; level++) {
+	for (level = 1; level <= 7; level++) {
 		if (!CLIDR_CTYPE(clidr, level))
 			break;
 	}