configure i2c ctrl
| SDA_FORCE_OUT | 1=push pull,0=open drain |
| SCL_FORCE_OUT | 1=push pull,0=open drain |
| MS_MODE | 1=master,0=slave |
| TRANS_START | force start |
| TX_LSB_FIRST | transit lsb first |
| RX_LSB_FIRST | receive lsb first |
| I2C_CTRL_CLK_GATE_EN | configure i2c ctrl clk enable |
| I2C_RESET | rtc i2c sw reset |
| I2CCLK_EN | rtc i2c reg clk gating |