crypto: ixp4xx - Do not check word size when compile testing

The BUILD_BUG_ON preventing compilation on foreign architectures
should be disabled when we're doing compile testing.

Fixes: 1bc7fdbf ("crypto: ixp4xx - Move driver to...")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/oe-kbuild-all/202304061846.G6cpPXiQ-lkp@intel.com/Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/intel/ixp4xx/ixp4xx_crypto.c

@@ -263,7 +263,8 @@ static int setup_crypt_desc(void)
 {
 	struct device *dev = &pdev->dev;
 
-	BUILD_BUG_ON(sizeof(struct crypt_ctl) != 64);
+	BUILD_BUG_ON(!IS_ENABLED(CONFIG_COMPILE_TEST) &&
+		     sizeof(struct crypt_ctl) != 64);
 	crypt_virt = dma_alloc_coherent(dev,
 					NPE_QLEN * sizeof(struct crypt_ctl),
 					&crypt_phys, GFP_ATOMIC);