intel: add idep_genxml to per_hw target dependencies
Hopefully fixes
In file included from ../src/gallium/drivers/crocus/crocus_blt.c:26:
../src/gallium/drivers/crocus/crocus_genx_macros.h:86:10: fatal error: 'genxml/genX_bits.h' file not found
#include "genxml/genX_bits.h"
^~~~~~~~~~~~~~~~~~~~
See https://gitlab.freedesktop.org/mesa/mesa/-/jobs/12368280.
Let me know if iris and i965 do not need the same treatment.