crypto: x86/crc32c - fix building with clang ias

The clang integrated assembler complains about movzxw:

arch/x86/crypto/crc32c-pcl-intel-asm_64.S:173:2: error: invalid instruction mnemonic 'movzxw'

It seems that movzwq is the mnemonic that it expects instead,
and this is what objdump prints when disassembling the file.

Fixes: 6a8ce1ef ("crypto: crc32c - Optimize CRC32C calculation with PCLMULQDQ instruction")
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

arch/x86/crypto/crc32c-pcl-intel-asm_64.S

@@ -169,7 +169,7 @@ continue_block:
 
 	## branch into array
 	lea	jump_table(%rip), %bufp
-	movzxw  (%bufp, %rax, 2), len
+	movzwq  (%bufp, %rax, 2), len
 	lea	crc_array(%rip), %bufp
 	lea     (%bufp, len, 1), %bufp
 	JMP_NOSPEC bufp