crc16-ccitt: Rename file with CRC-16-CCITT implementation to crc16-ccitt.c

U-Boot CRC-16 implementation uses polynomial x^16 + x^12 + x^5 + 1 which is
not standard CRC-16 algorithm, but it is known as CRC-16-CCITT. Rename file
crc16.c to crc16-ccitt.c to reduce confusion.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/lib/Makefile b/lib/Makefile
index 13fe5fb..cf662a7 100644
--- a/lib/Makefile
+++ b/lib/Makefile
@@ -35,7 +35,7 @@
 endif
 
 obj-y += crc8.o
-obj-y += crc16.o
+obj-y += crc16-ccitt.o
 obj-$(CONFIG_ERRNO_STR) += errno_str.o
 obj-$(CONFIG_FIT) += fdtdec_common.o
 obj-$(CONFIG_TEST_FDTDEC) += fdtdec_test.o
@@ -91,9 +91,9 @@
 obj-$(CONFIG_$(SPL_TPL_)OF_REAL) += fdtdec_common.o fdtdec.o
 
 ifdef CONFIG_SPL_BUILD
-obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16.o
-obj-$(CONFIG_$(SPL_TPL_)HASH) += crc16.o
-obj-$(CONFIG_MMC_SPI_CRC_ON) += crc16.o
+obj-$(CONFIG_SPL_YMODEM_SUPPORT) += crc16-ccitt.o
+obj-$(CONFIG_$(SPL_TPL_)HASH) += crc16-ccitt.o
+obj-$(CONFIG_MMC_SPI_CRC_ON) += crc16-ccitt.o
 obj-y += net_utils.o
 endif
 obj-$(CONFIG_ADDR_MAP) += addr_map.o