SPI flash hardware sends 52h command, which is a 32KB erase.
There is a matching bug in the ROM SPIEraseArea code, unless
flashchip->block_size is modified first.
1. timer reg file for both time group 0 and time group 1, not only timer group 0
2. fix bug that io mux header file mismatch with chip
3. fix bug that some BASE address not correct
4. add some static function to eagle.fpga32.rom.addr.v7.ld
5. add interrupts usage table
6. add some comments for rom code functions