HAL [LPC824] Fix multi channel I2C issue

- Update resource count value which did not count up during multiple
channel I2C resources are used
Merge pull request #598 from toyowata/master

HAL: LPC824 - Fix multi channel I2C issue
[LPC824] I2C ROMAPI/bitrate related fix

- I2C did not work as ROMAPI initialization override CFG register settings at i2c_init()
- i2c_frequency() ignored bitrate settings
Merge pull request #604 from K4zuki/master

HAL: LPC824 - I2C ROMAPI/bitrate related fix