imx: sys_proto: add is_imx8qm helper

Add is_imx8qm helper which could be used by SoC and Driver code.

Signed-off-by: Peng Fan <peng.fan@nxp.com>
diff --git a/arch/arm/include/asm/mach-imx/sys_proto.h b/arch/arm/include/asm/mach-imx/sys_proto.h
index 2606080..449366f 100644
--- a/arch/arm/include/asm/mach-imx/sys_proto.h
+++ b/arch/arm/include/asm/mach-imx/sys_proto.h
@@ -44,6 +44,7 @@
 #define is_mx7ulp() (is_cpu_type(MXC_CPU_MX7ULP))
 
 #define is_imx8mq() (is_cpu_type(MXC_CPU_IMX8MQ))
+#define is_imx8qm() (is_cpu_type(MXC_CPU_IMX8QM))
 #define is_imx8qxp() (is_cpu_type(MXC_CPU_IMX8QXP))
 
 #ifdef CONFIG_MX6