MFC 300985, 301103

r300985
bge: Support 5717 C0, which is almost same as 5720 A0

PR: 209758
Obtained from: DragonFlyBSD d79f5d8f5fe94cd6769207b2901422977d502bc0
MFC after: 1 week

r301103
bge: Force chipid to 5720 A0 for 5717 C0 in an early place

Discussed with: yongari
MFC after: 1 week
Sponsored by: Microsoft OSTC