fix(zynqmp): resolve misra R15.7 warnings

MISRA Violation: MISRA-C:2012 R.15.7
- All if . . else if constructs shall be terminated
with an else statement.

Signed-off-by: Venkatesh Yadav Abbarapu <venkatesh.abbarapu@xilinx.com>
Change-Id: If921ca7c30b2feea6535791aa15f4de7101c3134

plat/xilinx/common/ipi.c

@@ -95,6 +95,8 @@ int ipi_mb_validate(uint32_t local, uint32_t remote, unsigned int is_secure)
 		ret = -EPERM;
 	} else if (IPI_IS_SECURE(remote) && !is_secure) {
 		ret = -EPERM;
+	} else {
+		/* To fix the misra 15.7 warning */
 	}
 
 	return ret;

plat/xilinx/zynqmp/bl31_zynqmp_setup.c

@@ -83,6 +83,8 @@ void bl31_early_platform_setup2(u_register_t arg0, u_register_t arg1,
 		if (rc == 0) {
 			panic();
 		}
+	} else {
+		ERROR("BL31: No console device found.\n");
 	}
 	/* Initialize the platform config for future decision making */
 	zynqmp_config_setup();

plat/xilinx/zynqmp/pm_service/pm_api_clock.c

@@ -3039,6 +3039,8 @@ uint8_t pm_clock_has_div(unsigned int clock_id, enum pm_clock_div_id div_id)
 		} else if (nodes[i].type == TYPE_DIV2) {
 			if (div_id == PM_CLOCK_DIV1_ID)
 				return 1;
+		} else {
+			/* To fix the misra 15.7 warning */
 		}
 	}