fix hardcoded version mask on BM1366

[skot]

Currently esp-miner always uses the BM1366 default(?) 0x1fffe000 as the version mask. Technically esp-miner should configure the BM1366 to use the version mask the stratum server & client negotiate, even if most of the time it's 0x1fffe000

[johnny9]

Likely just need to write the mask to register A4

Here is our understanding of A4