meta-raspberrypi: subtree update:4776ecc532..254c9366b9

Martin Jansa (1):
      linux-raspberrypi=4.19.80 bcm2835-bootfiles=20191021

Paul Barker (4):
      licenses: Drop unused Broadcom license file
      armstubs: License is BSD-3-Clause
      bcm2835-bootfiles: Clarify license conditions
      vc-graphics: Clarify license conditions

Change-Id: I2238c23361c7140f4651faba33c11eb150cdcda6
Signed-off-by: Brad Bishop <bradleyb@fuzziesquirrel.com>