Compile pflash_cfi02 only once

Push TARGET_WORDS_BIGENDIAN dependency to board level.

Signed-off-by: Blue Swirl <blauwirbel@gmail.com>
diff --git a/default-configs/cris-softmmu.mak b/default-configs/cris-softmmu.mak
index b8c281b..e0d2cab 100644
--- a/default-configs/cris-softmmu.mak
+++ b/default-configs/cris-softmmu.mak
@@ -3,3 +3,4 @@
 CONFIG_NAND=y
 CONFIG_PTIMER=y
 CONFIG_VIRTIO_PCI=y
+CONFIG_PFLASH_CFI02=y