based on LS1G DEMO BOARD V1.1

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Modify IIC and USART drivers to avoid compiling error.

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1655 bbd45198-f89e-11dd-88c7-29a3b14d5316

1. Add interrupt context check function (context_gcc.S)
2. Add lock (semaphore) for IIC, USART and Ethernet drivers to prevent simultaneously access
3. Add multiple channels support for scan mode of ADC driver
4. Modify miscellaneous drivers according to ADC driver changes
5. Add SWO output enable function (board.c)
6. Disable all interrupts in GPIO interrupt handler (hdl_interrupt.c)
7. Add two Ethernet utility functions (drv_ethernet.c)
8. Add accelerometer driver (analog output)
9. Add accelerometer demo (draft, application.c)

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re-implemented ethernetif and power-on flow of lwip1.4, note:  ethnet driver and init invokings also need to be modified.

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1. Solve the problem mentioned in revision 1623 (runtime error) 
   - Cause: In the EFM32 demo application, some TCP/IP functions are called in non-task context (e.g. "tcp_new()"). And after revision 1621, those functions will trigger the scheduler ("rt_schedule()") which seems to be triggered only in task context. 

git-svn-id: https://rt-thread.googlecode.com/svn/trunk@1624 bbd45198-f89e-11dd-88c7-29a3b14d5316

1. Remove "RT_USING_NETUTILS" defined in "rtconfig.h" to avoid compiling error
   - Warning: Due to the memory limitation, running lwIP on Gecko devices (EFM32G) is not properly tested.
   - Warning: To test lwIP, please revert the file, "components\net\lwip\src\arch\sys_arch.c", to revision 1620. There is a runtime error when working with the latest revision of that file. This error is currently under evaluation.

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