1. capture 5 raw data, buf reserve 6 frames size
2. fixes first frame anomaly
3. speed up i2c0 to 1MHz
4. reduce almost mcu-log before first frame
Test on battery-evb board under LP4 924MHz, the first frame was got at
92ms since RISC-V is running.
L 0, 1, 92, 0x8001000, 5533696, 0x1d8, 0x80, tick:93
Change-Id: Idaa0c141010093e022e9c9a20d5999e3f93195ec
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>