imx: mx6: hab : Remove the cache issue workaroud in hab for i.MX6QP

Since the i.MX6QP has fixed the issue in boot ROM, so remove the workaround
for i.MX6QP.
Signed-off-by: NYe.Li <B37916@freescale.com>
Signed-off-by: NPeng Fan <Peng.Fan@freescale.com>
Acked-by: NStefano Babic <sbabic@denx.de>

arch/arm/cpu/armv7/mx6/hab.c

@@ -423,6 +423,7 @@ uint32_t authenticate_image(uint32_t ddr_start, uint32_t image_size)
 					 * do cache flushes. don't think any
 					 * exist, so we ignore them.
 					 */
+					if (!is_mx6dqp())
 						writel(1, MX6DQ_PU_IROM_MMU_EN_VAR);
 				} else if (is_cpu_type(MXC_CPU_MX6DL) ||
 					   is_cpu_type(MXC_CPU_MX6SOLO)) {