Makefile: move fs/fat/ entry to drivers/Makefile

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
Cc: Simon Glass <sjg@chromium.org>
Acked-by: Simon Glass <sjg@chromium.org>
diff --git a/spl/Makefile b/spl/Makefile
index 5bc75b4..29d7818 100644
--- a/spl/Makefile
+++ b/spl/Makefile
@@ -73,7 +73,7 @@
 LIBS-$(CONFIG_SPL_SERIAL_SUPPORT) += drivers/serial/
 LIBS-$(CONFIG_SPL_SPI_FLASH_SUPPORT) += drivers/mtd/spi/
 LIBS-$(CONFIG_SPL_SPI_SUPPORT) += drivers/spi/
-LIBS-$(CONFIG_SPL_FAT_SUPPORT) += fs/fat/
+LIBS-y += fs/
 LIBS-$(CONFIG_SPL_LIBGENERIC_SUPPORT) += lib/
 LIBS-$(CONFIG_SPL_POWER_SUPPORT) += drivers/power/ \
 	drivers/power/pmic/