main/u-boot: for raspberrypi subpackage add missing dependancy

The u-boot binary is chainloaded by the usual Raspberry Pi bootcode.bin
file - the u-boot.bin file is specified as "kernel" value in the
config.txt file read by bootcode.bin. Therefore the u-boot-raspberrypi
package should depends on the raspberrypi-bootloader package.
7 jobs for !15746 with u-boot-rpi-add-dep in 7 minutes and 43 seconds (queued for 1 second)
latest detached
Status Job ID Name Coverage
  Lint
failed #270339
docker-alpine x86_64 allowed to fail
lint

00:00:18

 
  Build
passed #270344
docker-alpine ci-build aarch64
build-aarch64

00:02:59

passed #270345
docker-alpine ci-build armv7
build-armv7

00:07:22

passed #270343
docker-alpine ci-build ppc64le
build-ppc64le

00:00:41

passed #270342
docker-alpine ci-build s390x
build-s390x

00:00:46

passed #270341
docker-alpine ci-build x86
build-x86

00:00:19

passed #270340
docker-alpine ci-build x86_64
build-x86_64

00:00:22

 
Name Stage Failure
failed
lint Lint
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