package/rtl8189es: fix build failure due to missing Linux CONFIG_NET

Since not every defconfig provides it let's enable CONFIG_NET that is
required to build rtl8189es successfully.

Fixes:
https://autobuild.buildroot.org/results/835973d5b71bb085f62c533867746fc3d6b3a8c7

Signed-off-by: Giulio Benetti <giulio.benetti@benettiengineering.com>
Signed-off-by: Romain Naour <romain.naour@smile.fr>

package/rtl8189es/rtl8189es.mk

@@ -20,6 +20,7 @@ endif
 
 define RTL8189ES_LINUX_CONFIG_FIXUPS
 	$(call KCONFIG_ENABLE_OPT,CONFIG_NET)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_INET)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_WIRELESS)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_CFG80211)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_MMC)