package/nxp-mwifiex: enable Linux option RTC_CLASS

Without Linux option RTC_CLASS enabled, the build fails with:

ERROR: modpost: "rtc_ktime_to_tm" [/home/sszy/development/eb972b781ead357c3e44a880cc1b8e4ab4b15b58/output/build/nxp-mwifiex-lf-6.6.52_2.2.0/./moal.ko] undefined!

Fix that by enbaling RTC_CLASS.

Signed-off-by: Sébastien Szymanski <sebastien.szymanski@armadeus.com>
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/nxp-mwifiex/nxp-mwifiex.mk

@@ -19,6 +19,7 @@ define NXP_MWIFIEX_LINUX_CONFIG_FIXUPS
 	$(call KCONFIG_ENABLE_OPT,CONFIG_USB)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_MMC)
 	$(call KCONFIG_ENABLE_OPT,CONFIG_PCI)
+	$(call KCONFIG_ENABLE_OPT,CONFIG_RTC_CLASS)
 endef
 
 $(eval $(kernel-module))