FP5: Include vendor/debugfs.config

This disables the following kernel configs:
* CONFIG_DEBUG_FS
* CONFIG_PAGE_OWNER

Change-Id: Idbf74e3dee4dccff4708462271e79374e28449ae
diff --git a/BoardConfig.mk b/BoardConfig.mk
index 7d9a6ea..6c282b8 100644
--- a/BoardConfig.mk
+++ b/BoardConfig.mk
@@ -102,7 +102,7 @@
 
 BOARD_KERNEL_IMAGE_NAME := Image
 BOARD_KERNEL_SEPARATED_DTBO := true
-TARGET_KERNEL_CONFIG := vendor/fp5-qgki_defconfig vendor/fp5.config
+TARGET_KERNEL_CONFIG := vendor/fp5-qgki_defconfig vendor/debugfs.config vendor/fp5.config
 TARGET_KERNEL_NO_GCC := true
 TARGET_KERNEL_SOURCE := kernel/fairphone/qcm6490