clk: imx: Add clock support for imx6qp

most of the clock tree structures on i.MX6 Quad Plus are
same as on i.MX6Q. there still some differences between
these two SOCs. compared to the i.XM6Q, the differents of
clocks on i.MX6QP is mainly on:

1. New clock gate added to support the PRE and PRG modules
2. 24MHz OSC clock option added to the UART, IPG, ECSPI, and
   CAN clock roots.
3. MMDC channel 1 clock gate is now controllable.
4. clock gating added to the LDB_DIx_IPU clocks on i.MX6QP
5. EMI clock root divider fix
6. other updates fo CSCMRx, CSCDRx and CS2CDR registers.

detailed infomation, please refer to the i.MX6QP RM.
Signed-off-by: NBai Ping <ping.bai@nxp.com>
Signed-off-by: NShawn Guo <shawnguo@kernel.org>

include/dt-bindings/clock/imx6qdl-clock.h

@@ -255,6 +255,20 @@
 #define IMX6QDL_CLK_CAAM_ACLK			242
 #define IMX6QDL_CLK_CAAM_IPG			243
 #define IMX6QDL_CLK_SPDIF_GCLK			244
-#define IMX6QDL_CLK_END				245
+#define IMX6QDL_CLK_UART_SEL			245
+#define IMX6QDL_CLK_IPG_PER_SEL			246
+#define IMX6QDL_CLK_ECSPI_SEL			247
+#define IMX6QDL_CLK_CAN_SEL			248
+#define IMX6QDL_CLK_MMDC_CH1_AXI_CG		249
+#define IMX6QDL_CLK_PRE0			250
+#define IMX6QDL_CLK_PRE1			251
+#define IMX6QDL_CLK_PRE2			252
+#define IMX6QDL_CLK_PRE3			253
+#define IMX6QDL_CLK_PRG0_AXI			254
+#define IMX6QDL_CLK_PRG1_AXI			255
+#define IMX6QDL_CLK_PRG0_APB			256
+#define IMX6QDL_CLK_PRG1_APB			257
+#define IMX6QDL_CLK_PRE_AXI			258
+#define IMX6QDL_CLK_END				259
 
 #endif /* __DT_BINDINGS_CLOCK_IMX6QDL_H */