I2S module clock configuration register
| CLKM_DIV_NUM | Integral I2S clock divider value. |
| CLKM_DIV_B | Fractional clock divider numerator value. |
| CLKM_DIV_A | Fractional clock divider denominator value. |
| CLK_EN | Set this bit to enable clock gate. |
| CLK_SEL | Set this bit to select I2S module clock source. 0: No clock. 1: APLL_CLK. 2: PLL_160M_CLK. 3: No clock. |