run: align data after last boot module

In the image.elf file, the very last boot module is followed
by arbitrary other core-local data. Since those boot modules are
exported as page-granular dataspace to the outside of core via core's
ROM service, we need to ensure that the last page is padded with zeros.

tool/run/run

@@ -732,6 +732,7 @@ proc generate_boot_modules_asm {path modules} {
 		append asm_src "\n"
 	}
 
+	append asm_src ".p2align MIN_PAGE_SIZE_LOG2\n"
 	append asm_src ".global _boot_modules_binaries_end\n"
 	append asm_src "_boot_modules_binaries_end:\n"