add i2c device to android SDK of am335x

Hi Jun,

Adding support for a device on Android usually requires 2 steps:
1) port the device driver into the kernel
2) Add the HAL to interface the driver with Android framework

the second step can be bypassed by doing JNI directly from the JAVA application, even thought this is not the recommended architecture for security reasons.

The first step requires you to enable the driver in the kernel configuration (and develop it if it doesn't exist), then declare the device in the board file that you pointed since your kernel doesn't rely on the device tree: kernel/arch/arm/mach-omap2/board-am335xevm.c

Adding the device is done this way:
identify which i2c bus you are connected to and create a new struct i2c_board_info (at least i2c address and driver name), then register it on your i2c bus using the i2c_new_device function.