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/Makefile b/board/gateworks/gw_ventana/Makefile
index 360d1d4..c407f8e 100644
--- a/board/gateworks/gw_ventana/Makefile
+++ b/board/gateworks/gw_ventana/Makefile
@@ -6,5 +6,5 @@
 # SPDX-License-Identifier:  GPL-2.0+
 #
 
-obj-y  := gw_ventana.o gsc.o eeprom.o common.o
+obj-y  := gw_ventana.o eeprom.o common.o
 obj-$(CONFIG_SPL_BUILD) += gw_ventana_spl.o