Add support to CST816 chips with different register for chip ID

[Neradoc]

I have successfully used the library with a CST816D chips with no other modification than removing the test for the chip_type. For example the Waveshare esp32 s3 touch lcd 2 uses it as well as a generic ESP32-C3 round display board (that is not in CP yet).
When running, the library reports:

fw_version: B600, chip_type: 04

But it's the chip ID that's supposed to be B6.
I was not able to find a datasheet containing that information, but the CST816_TouchLib Arduino library has these constants. Also in zephyr's support.

const uint8_t TOUCH_REGISTER_CHIP_ID			= 0xA7;		//chip ID (/model) (1 byte)
const uint8_t TOUCH_REGISTER_PROJ_ID			= 0xA8;		//project number (1 byte)
const uint8_t TOUCH_REGISTER_FW_VERSION			= 0xA9;		//firmware version

So since the rest of the registers used seem to work the same, this PR just tries to find a chip ID to validate that it's a valid chip.

[tannewt]

Thank you!