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Allow patching the module

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_home_pr90312 into main

Example conf:

target-conf:
    kernel:
        modules:
            modules:
              lisa:
                overlays:
                  main.c: !call:lisa._kmod.PatchOverlay
                      overlay: !call:lisa._kmod.FileOverlay.from_content
                        content: "diff --git a/lisa/_assets/kmodules/lisa/main.c b/lisa/_assets/kmodules/lisa/main.c\nindex a3d1b3942..67192ecda 100644\n--- a/lisa/_assets/kmodules/lisa/main.c\n+++ b/lisa/_assets/kmodules/lisa/main.c\n@@ -26,6 +26,7 @@ static void modexit(void) {\n static int __init modinit(void) {\n \tint ret;\n \n+\tpr_info(\"HELLO WORLD!\");\n \tpr_info(\"Loading Lisa module version %s\\n\", LISA_MODULE_VERSION);\n \tif (strcmp(version, LISA_MODULE_VERSION)) {\n \t\tpr_err(\"Lisa module version check failed. Got %s, expected %s\\n\", version, LISA_MODULE_VERSION);\n"

Note the 2 levels of "modules:", this is not a typo

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