package/php: add PHP_CPE_ID_VENDOR

cpe:2.3:a:php:php is a valid CPE identifier for this package:

  https://nvd.nist.gov/products/cpe/search/results?namingFormat=2.3&keyword=cpe%3A2.3%3Aa%3Aphp%3Aphp

Signed-off-by: Fabrice Fontaine <fontaine.fabrice@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/php/php.mk

@@ -13,6 +13,7 @@ PHP_INSTALL_TARGET_OPTS = INSTALL_ROOT=$(TARGET_DIR) install
 PHP_DEPENDENCIES = host-pkgconf pcre2
 PHP_LICENSE = PHP-3.01
 PHP_LICENSE_FILES = LICENSE
+PHP_CPE_ID_VENDOR = php
 PHP_CONF_OPTS = \
 	--mandir=/usr/share/man \
 	--infodir=/usr/share/info \