Integrate meta-seconorth-distro/kirkstone-rtl8723bu-firmware-fix-SDK-build

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@c858928c

recipe:rtl8723bu: Fix oelint warnings

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Commit: seco-ne/yocto/layers/meta-seconorth-distro@5f67b109

rtl8723bu: Remove firmware binaries again and rdepend on linux-firmware:

This fixes the SDK build, as both linux-firmware and this package have
added the same file in this commit:
f6fc1f1 recipe:rtl8723bu: Add firmware binaries and disable concurrent mode

Now the firmware is installed from linux-firmware into the image.