Merge patch series "Update the kbuild system to 5.1"

Ilias Apalodimas <ilias.apalodimas@linaro.org> says:

Another series backporting and merging patches from Linux 5.1 kbuild.
There is still a gap that I plan to update after this series gets
merged [0]

[0] https://source.denx.de/u-boot/custodians/u-boot-tpm/-/commit/5da099cef04fb5c02dcafab8d1bab8ddc2855765

Link: https://lore.kernel.org/r/20250611202449.2317279-1-ilias.apalodimas@linaro.org