hikey960.mk: install sdcardfs.ko into the ramdisk

to make the sdcardfs feature work.

Test: cts-tradefed could run with device information collected
      sdcardfs mountpoints listed in the mount command output

Signed-off-by: Yongqin Liu <yongqin.liu@linaro.org>
Change-Id: I62d30b6e2bcf28fcaf2baebdc7caa96c4c2f9a47
diff --git a/hikey960.mk b/hikey960.mk
index 2e338e9..7a31e09 100644
--- a/hikey960.mk
+++ b/hikey960.mk
@@ -46,6 +46,7 @@
     BOARD_VENDOR_KERNEL_MODULES += $(HIKEY_MODS)
     BOARD_VENDOR_RAMDISK_KERNEL_MODULES += \
 	$(HIKEY_MOD_DIR)/ion_cma_heap.ko \
+	$(HIKEY_MOD_DIR)/sdcardfs.ko \
 	$(HIKEY_MOD_DIR)/ufs-hisi.ko
   endif
 endif