Convert CONFIG_FSL_QIXIS et al to Kconfig

This converts the following to Kconfig:
   CONFIG_FSL_QIXIS
   CONFIG_QIXIS_I2C_ACCESS

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/board/freescale/common/Kconfig b/board/freescale/common/Kconfig
index b41d93b..6553bf6 100644
--- a/board/freescale/common/Kconfig
+++ b/board/freescale/common/Kconfig
@@ -99,3 +99,11 @@
 	 functionality. It is used by the common VID driver.
 
 endif
+
+config FSL_QIXIS
+	bool "Enable QIXIS support"
+
+config QIXIS_I2C_ACCESS
+	bool "Access to QIXIS is over i2c"
+	depends on FSL_QIXIS
+	default y