ec/google/chromeec/ec_commands.h: Remove repeated word

Change-Id: I87d5a5fa584b4250bc8b532c046e6bd070e33e81
Signed-off-by: Elyes HAOUAS <ehaouas@noos.fr>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/49531
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Jacob Garber <jgarber1@ualberta.ca>
diff --git a/src/ec/google/chromeec/ec_commands.h b/src/ec/google/chromeec/ec_commands.h
index 39e1cec..3bd6b93 100644
--- a/src/ec/google/chromeec/ec_commands.h
+++ b/src/ec/google/chromeec/ec_commands.h
@@ -896,7 +896,7 @@
  *
  * Packets always start with a request or response header.  They are followed
  * by data_len bytes of data.  If the data_crc_present flag is set, the data
- * bytes are followed by a CRC-8 of that data, using using x^8 + x^2 + x + 1
+ * bytes are followed by a CRC-8 of that data, using x^8 + x^2 + x + 1
  * polynomial.
  *
  * Host algorithm when sending a request q: