soft_i2c: cleanup - no mpc8xx support

commit 907208c452999 ("powerpc: Partialy restore core of mpc8xx")
didn't bring back support for I2C on the mpc8xx

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>

drivers/i2c/soft_i2c.c

@@ -25,9 +25,6 @@
 #include <asm/arch/gpio.h>
 #endif
 #endif
-#if defined(CONFIG_8xx)
-#include <asm/io.h>
-#endif
 #include <i2c.h>
 
 #if defined(CONFIG_SOFT_I2C_GPIO_SCL)