Add hook for modifying final command line before kexecing

hooks.h

@@ -44,6 +44,7 @@ int mrom_hook_has_kexec(void);
 #if MR_DEVICE_HOOKS >= 6
 void tramp_hook_encryption_setup(void);
 void tramp_hook_encryption_cleanup(void);
+void mrom_hook_fixup_full_cmdline(char *bootimg_cmdline, size_t bootimg_cmdline_cap);
 #endif
 
 #endif /* MR_DEVICE_HOOKS */

multirom.c

@@ -1715,6 +1715,10 @@ int multirom_fill_kexec_android(struct multirom_status *s, struct multirom_rom *
     if(!strstr(cmdline, " mrom_kexecd=1") && sizeof(cmdline)-strlen(cmdline)-1 >= sizeof("mrom_kexecd=1"))
         strcat(cmdline, "mrom_kexecd=1");
 
+#if MR_DEVICE_HOOKS >= 6
+    mrom_hook_fixup_full_cmdline(cmdline, sizeof(cmdline));
+#endif
+
     kexec_add_arg(kexec, cmdline);
 
     res = 0;