fs/squashfs: Fix compilation error

Commit 401d1c4f5d2d29c4bc4beaec95402ca23eb63295 ("common: Drop
asm/global_data.h from common header") broke compilation of squashfs
filesystem when CONFIG_CMD_SQUASHFS=y is enabled.

Compilation is failing on error:

    aarch64-linux-gnu-ld.bfd: u-boot/fs/squashfs/sqfs_inode.c:121: undefined reference to `le32_to_cpu'

Fixes: 401d1c4f5d2d29c4bc4beaec95402ca23eb63295 ("common: Drop asm/global_data.h from common header")
Suggested-by: Tom Rini <trini@konsulko.com>
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/fs/squashfs/sqfs_inode.c b/fs/squashfs/sqfs_inode.c
index e76ec7c..d25cfb5 100644
--- a/fs/squashfs/sqfs_inode.c
+++ b/fs/squashfs/sqfs_inode.c
@@ -6,6 +6,7 @@
  */
 
 #include <asm/unaligned.h>
+#include <compiler.h>
 #include <errno.h>
 #include <stdint.h>
 #include <stdio.h>