fix(qemu): fix build error with spmd

Currently when building with PLAT=qemu SPD=spmd SPMC_AT_EL3=1
SPMD_SPM_AT_SEL2=0, there is a build error since
plat_spmd_handle_group0_interrupt() is called irrespective of
SPMC_AT_EL3. Fix this by making plat_spmd_handle_group0_interrupt()
available if SPD_spmd is defined only.

Change-Id: If5f650d2bd3675cbb4b509e9e3743d3865d7c812
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
diff --git a/plat/qemu/common/qemu_common.c b/plat/qemu/common/qemu_common.c
index 068c69c..0702673 100644
--- a/plat/qemu/common/qemu_common.c
+++ b/plat/qemu/common/qemu_common.c
@@ -198,16 +198,17 @@
 }
 #endif
 
-#if defined(SPD_spmd) && (SPMC_AT_EL3 == 0)
-/*
- * A dummy implementation of the platform handler for Group0 secure interrupt.
- */
+#if defined(SPD_spmd)
 int plat_spmd_handle_group0_interrupt(uint32_t intid)
 {
+	/*
+	 * Currently, there are no sources of Group0 secure interrupt
+	 * enabled for QEMU.
+	 */
 	(void)intid;
 	return -1;
 }
-#endif /*defined(SPD_spmd) && (SPMC_AT_EL3 == 0)*/
+#endif /*defined(SPD_spmd)*/
 
 #if ENABLE_RME
 /*