tools/erofs-utils: assign PKG_CPE_ID

cpe:/a:erofs-utils_project:erofs-utils is the correct CPE ID for erofs-utils:
https://nvd.nist.gov/products/cpe/search/results?keyword=cpe:2.3:a:erofs-utils_project:erofs-utils

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Link: openwrt/openwrt#22425
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>

Author: ffontaine

tools/erofs-utils/Makefile

@@ -15,6 +15,7 @@ PKG_SOURCE_URL=https://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs-utils
 PKG_MIRROR_HASH:=a21d244aee8cb216ac4436bf7f790e75fca113ea9a5512c8e4ac530c4983ef32
 PKG_SOURCE_DATE:=2025-07-15
 PKG_SOURCE_VERSION:=51b5939b5f783221310d25146e6a2019ba8129b6
+PKG_CPE_ID:=cpe:/a:erofs-utils_project:erofs-utils
 
 PKG_FIXUP:=autoreconf