ARM: imx6q: add the missing esai_ahb clock

The esai_ahb clock is derived from ahb and used to provide ESAI the
capability of register accessing and FSYS clock source for I2S clocks
dividing.  The gate bits of this esai_ahb clock are shared with the
esai clock -- the baud clock, so we need to call imx_clk_gate2_shared()
for these two clocks.
Signed-off-by: Nicolin Chen <Guangyu.Chen@freescale.com>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>

Documentation/devicetree/bindings/clock/imx6q-clock.txt

@@ -220,6 +220,7 @@ clocks and IDs.
 	lvds2_sel		205
 	lvds1_gate		206
 	lvds2_gate		207
+	esai_ahb		208
 
 Examples:
 

arch/arm/mach-imx/clk-imx6q.c

@@ -107,7 +107,7 @@ enum mx6q_clks {
 	sata_ref, sata_ref_100m, pcie_ref, pcie_ref_125m, enet_ref, usbphy1_gate,
 	usbphy2_gate, pll4_post_div, pll5_post_div, pll5_video_div, eim_slow,
 	spdif, cko2_sel, cko2_podf, cko2, cko, vdoa, pll4_audio_div,
-	lvds1_sel, lvds2_sel, lvds1_gate, lvds2_gate, clk_max
+	lvds1_sel, lvds2_sel, lvds1_gate, lvds2_gate, esai_ahb, clk_max
 };
 
 static struct clk *clk[clk_max];
@@ -140,6 +140,8 @@ static struct clk_div_table video_div_table[] = {
 	{ /* sentinel */ }
 };
 
+static unsigned int share_count_esai;
+
 static void __init imx6q_clocks_init(struct device_node *ccm_node)
 {
 	struct device_node *np;
@@ -358,7 +360,8 @@ static void __init imx6q_clocks_init(struct device_node *ccm_node)
 	else
 		clk[ecspi5] = imx_clk_gate2("ecspi5",      "ecspi_root",        base + 0x6c, 8);
 	clk[enet]         = imx_clk_gate2("enet",          "ipg",               base + 0x6c, 10);
-	clk[esai]         = imx_clk_gate2("esai",          "esai_podf",         base + 0x6c, 16);
+	clk[esai]         = imx_clk_gate2_shared("esai",   "esai_podf",         base + 0x6c, 16, &share_count_esai);
+	clk[esai_ahb]     = imx_clk_gate2_shared("esai_ahb", "ahb",             base + 0x6c, 16, &share_count_esai);
 	clk[gpt_ipg]      = imx_clk_gate2("gpt_ipg",       "ipg",               base + 0x6c, 20);
 	clk[gpt_ipg_per]  = imx_clk_gate2("gpt_ipg_per",   "ipg_per",           base + 0x6c, 22);
 	if (cpu_is_imx6dl())