mx6sxsabreauto: Remove legacy CONFIG_PCA953X

When this board was switched to using more DM drivers we didn't disable
the legacy PCA953X driver.  This in turn learn to a build time warning
about implicit functions as i2c.h would not say anything about
'i2c_read' nor 'i2c_write'.  But this was not a fatal error as none of
the legacy driver would be linked in either.

Fixes: e389033f ("imx: mx6sxsabreauto: enable more dm drivers")
Reviewed-by: NStefano Babic <sbabic@denx.de>
Signed-off-by: NTom Rini <trini@konsulko.com>

include/configs/mx6sxsabreauto.h

@@ -182,7 +182,4 @@
 #define CONFIG_SYS_MMC_ENV_DEV		0  /*USDHC3*/
 #endif
 
-#define CONFIG_PCA953X
-#define CONFIG_SYS_I2C_PCA953X_WIDTH	{ {0x30, 8}, {0x32, 8}, {0x34, 8} }
-
 #endif				/* __CONFIG_H */