Fixed a bug of serial interrupt

I fixed a bug of serial interrupt as below.
Serial TX/RX interrupt was not occur when TX/RX end.
Fixed some function's bugs

Fixed some bugs and modified mmu setting.
Fixed functions as below
- analog in
- i2c
- interruptin
Merge pull request #703 from masaohamanaka/master

Targets: RZ_A1H - Fixed a bug of serial interrupt