intel: devinfo: fix assertion on devices with odd number of EUs

intel: devinfo: fix assertion on devices with odd number of EUs

I forgot to change the assert in the second helper function in a
previous change.

This hit the assert() on a Broadwell platform with 1 slice, 3
subslices but all EUs disabled in subslice 1 & 2.

Fixes: c1900f5b0fb ("intel: devinfo: add helper functions to fill fusing masks values")
Signed-off-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>