drivers: iommu: fix clang -wformat warning

When building with Clang we encounter the following warning:
| drivers/iommu/msm_iommu.c:603:6: error: format specifies type 'unsigned
| short' but the argument has type 'int' [-Werror,-Wformat] sid);

`sid` is an int, use the proper format specifier `%x`.

Link: https://github.com/ClangBuiltLinux/linux/issues/378
Reported-by: Nathan Chancellor <nathan@kernel.org>
Suggested-by: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Nathan Chancellor <nathan@kernel.org>
Link: https://lore.kernel.org/r/20220721210331.4012015-1-justinstitt@google.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>