omap: am335x_evm: enable i2c1 channel

This patch sets up pinmux, enables fclk, and
defines CONFIG_I2C_MULTI_BUS

Signed-off-by: Steve Sakoman <steve@sakoman.com>
diff --git a/board/ti/am335x/evm.c b/board/ti/am335x/evm.c
index f2e355c..0d0affa 100644
--- a/board/ti/am335x/evm.c
+++ b/board/ti/am335x/evm.c
@@ -30,6 +30,7 @@
 
 #ifdef CONFIG_I2C
 	enable_i2c0_pin_mux();
+	enable_i2c1_pin_mux();
 	i2c_init(CONFIG_SYS_I2C_SPEED, CONFIG_SYS_I2C_SLAVE);
 #endif