imx: mx6sl: Add perclk_clk_sel bit define in CCM

The MX6SL has the perclk_clk_sel to select the perclk source. Add
its define in CCM

Signed-off-by: Ye.Li <B37916@freescale.com>
diff --git a/arch/arm/include/asm/arch-mx6/crm_regs.h b/arch/arm/include/asm/arch-mx6/crm_regs.h
index 92f9b21..39f3c07 100644
--- a/arch/arm/include/asm/arch-mx6/crm_regs.h
+++ b/arch/arm/include/asm/arch-mx6/crm_regs.h
@@ -228,6 +228,8 @@
 #ifdef CONFIG_MX6SX
 #define MXC_CCM_CSCMR1_QSPI1_CLK_SEL_MASK		(0x7 << 7)
 #define MXC_CCM_CSCMR1_QSPI1_CLK_SEL_OFFSET		7
+#endif
+#if (defined(CONFIG_MX6SL) || defined(CONFIG_MX6SX))
 #define MXC_CCM_CSCMR1_PER_CLK_SEL_MASK			(1 << 6)
 #define MXC_CCM_CSCMR1_PER_CLK_SEL_OFFSET		6
 #endif