qca4019: qca9888: add bdfs for Netgear RBR20

All three boardfiles were extracted from this vendor image: RBR20-V2.7.5.6.img

board-netgear_rbr20.qca4019:
FileSize: 24316
FileCRC32: b7cd21a8
FileMD5: 558186f6caf71f6b2823118c1213b4bf
BoardNames[0]: 'bus=ahb,bmi-chip-id=0,bmi-board-id=20,variant=Netgear-RBR20'
BoardLength[0]: 12064
BoardCRC32[0]: b237383e
BoardMD5[0]: ad1e2924e64ee8c9f8756dd511a161c6
BoardNames[1]: 'bus=ahb,bmi-chip-id=0,bmi-board-id=21,variant=Netgear-RBR20'
BoardLength[1]: 12064
BoardCRC32[1]: 7f1e595c
BoardMD5[1]: db9b2aafa442140e7327020cfa98f09b

board-netgear_rbr20.qca9888:
FileSize: 12168
FileCRC32: 5d7154ca
FileMD5: e35d8fb8c384aa2a9ca9851e8d14c905
BoardNames[0]: 'bus=pci,bmi-chip-id=0,bmi-board-id=17,variant=Netgear-RBR20'
BoardLength[0]: 12064
BoardCRC32[0]: d28bd550
BoardMD5[0]: ef84f0eba6035c5f4233d1c52f3d4d0e

Signed-off-by: Christoph Krapp <[email protected]>

Author: achterin