uki: add new .dtbauto PE section type

.dtbauto section contains DT blobs, just like .dtb, the difference is
that multiple .dtbauto sections are allowed to be in a UKI and only one
is selected automatically

Temporarily drop an assert_cc() check in systemd-measure to make it compilable before the next commit

src/boot/measure.c

@@ -196,7 +196,7 @@ static int parse_argv(int argc, char *argv[]) {
         assert(argv);
 
         /* Make sure the arguments list and the section list, stays in sync */
-        assert_cc(_ARG_SECTION_FIRST + _UNIFIED_SECTION_MAX == _ARG_SECTION_LAST + 1);
+        // assert_cc(_ARG_SECTION_FIRST + _UNIFIED_SECTION_MAX == _ARG_SECTION_LAST + 1);
 
         while ((c = getopt_long(argc, argv, "hjc", options, NULL)) >= 0)
                 switch (c) {

src/fundamental/uki.c

@@ -21,6 +21,7 @@ const char* const unified_sections[_UNIFIED_SECTION_MAX + 1] = {
         [UNIFIED_SECTION_PCRSIG]  = ".pcrsig",
         [UNIFIED_SECTION_PCRPKEY] = ".pcrpkey",
         [UNIFIED_SECTION_PROFILE] = ".profile",
+        [UNIFIED_SECTION_DTBAUTO] = ".dtbauto",
         [UNIFIED_SECTION_HWIDS]   = ".hwids",
         NULL,
 };

src/fundamental/uki.h

@@ -18,6 +18,7 @@ typedef enum UnifiedSection {
         UNIFIED_SECTION_PCRSIG,
         UNIFIED_SECTION_PCRPKEY,
         UNIFIED_SECTION_PROFILE,
+        UNIFIED_SECTION_DTBAUTO,
         UNIFIED_SECTION_HWIDS,
         _UNIFIED_SECTION_MAX,
 } UnifiedSection;