Makefile.inc: Fix typo in comment

Replace FILANAME with FILENAME.

Change-Id: I96388245df406e6b4cb1cd3418f6a32d5b23499f
Signed-off-by: Jeremy Compostella <jeremy.compostella@intel.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/76890
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Reviewed-by: Sridhar Siricilla <sridhar.siricilla@intel.com>
Reviewed-by: Pratikkumar V Prajapati <pratikkumar.v.prajapati@intel.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
diff --git a/Makefile.inc b/Makefile.inc
index 094387f..414ef76 100644
--- a/Makefile.inc
+++ b/Makefile.inc
@@ -831,7 +831,7 @@
 #                mma, efi, deleted, null
 # 4 - Compression type      [$(FILENAME)-compression]
 #                      none, LZMA
-# 5 - Base address          [$(FILANAME)-position]
+# 5 - Base address          [$(FILENAME)-position]
 # 6 - Alignment             [$(FILENAME)-align]
 # 7 - cbfstool flags        [$(FILENAME)-options]
 #