pan/bit: Remove BI_SHIFT stub

Fixes compile error with -Dtools=panfrost

Signed-off-by: Alyssa Rosenzweig <alyssa.rosenzweig@collabora.com>
Fixes: 946ff9b4396 ("bifrost: Add support for nir_op_ishl")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6142>
1 file changed