drivers:modify the i2c gpio config.
drivers:add the uda1380 driver.
examples:add the 6_media_wav example project.
examples:add the mp3 play example project.
modify the LPC_EXT_SDRAM define to rtconfig.h.
uda1380:close the DMA.
Merge pull request #33 from nongxiaoming/master

add the audio examples.