panfrost: Fix size assertion in bi_alu_src_index
Shifting by the bitsize was not only wrong, it was causing undefined behavior when bitsize is 32, causing the assertion to fire on AArch32.
Fixes: 95d62ee7 ("pan/bi: Add bi_alu_src_index helper")
Shifting by the bitsize was not only wrong, it was causing undefined behavior when bitsize is 32, causing the assertion to fire on AArch32.
Fixes: 95d62ee7 ("pan/bi: Add bi_alu_src_index helper")