usb: chipidea: add ahb burst configuration interface

The users can change it through dts or platform data if they
want to change the default value.

Signed-off-by: Peter Chen <peter.chen@freescale.com>
diff --git a/include/linux/usb/chipidea.h b/include/linux/usb/chipidea.h
index 4d34a86..cd7fcad 100644
--- a/include/linux/usb/chipidea.h
+++ b/include/linux/usb/chipidea.h
@@ -33,6 +33,7 @@
 #define CI_HDRC_FORCE_FULLSPEED		BIT(6)
 #define CI_HDRC_TURN_VBUS_EARLY_ON	BIT(7)
 #define CI_HDRC_SET_NON_ZERO_TTHA	BIT(8)
+#define CI_HDRC_OVERRIDE_AHB_BURST	BIT(9)
 	enum usb_dr_mode	dr_mode;
 #define CI_HDRC_CONTROLLER_RESET_EVENT		0
 #define CI_HDRC_CONTROLLER_STOPPED_EVENT	1
@@ -41,6 +42,7 @@
 	bool			tpl_support;
 	/* interrupt threshold setting */
 	u32			itc_setting;
+	u32			ahb_burst_config;
 };
 
 /* Default offset of capability registers */