board: gateworks: gw_ventana: use comomn GSC driver

Use the common GSC driver.

This allows us to do some additional cleanup:
 - use the GSC driver functions
 - move waiting for the EEPROM to the SPL int (it will always be ready
   after this)
 - move eeprom functions into eeprom file and elimate GSC_I2C_BUS
 - eliminate some redundant EEPROM reads (the EEPROM must be read in
   SPL before relocation, in SPL after relocation, and in U-Boot init.
   All subsequent uses can use the global structure)
 - remove unnecessary header files and alphabatize includes

Signed-off-by: Tim Harvey <tharvey@gateworks.com>
diff --git a/board/gateworks/gw_ventana/common.h b/board/gateworks/gw_ventana/common.h
index 7a60db7..480c667 100644
--- a/board/gateworks/gw_ventana/common.h
+++ b/board/gateworks/gw_ventana/common.h
@@ -8,7 +8,7 @@
 #ifndef _GWVENTANA_COMMON_H_
 #define _GWVENTANA_COMMON_H_
 
-#include "ventana_eeprom.h"
+#include "eeprom.h"
 
 /* GPIO's common to all baseboards */
 #define GP_RS232_EN	IMX_GPIO_NR(2, 11)
@@ -80,6 +80,6 @@
 extern struct ventana gpio_cfg[GW_UNKNOWN];
 
 /* configure gpio iomux/defaults */
-void setup_iomux_gpio(int board, struct ventana_board_info *);
+void setup_iomux_gpio(int board);
 
 #endif /* #ifndef _GWVENTANA_COMMON_H_ */