genxml: Make 1-bit L3$ config register fields bool on Gen7

Otherwise, they look like booleans but, if you put a value other than
0/1 in them, the GenXML generator code will explode.

Fixes: b6875b00 "anv: Drop has_slm in emit_l3_config for gen11+"
Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Part-of: <!9614>
35 jobs for !9614 with review/genxml-gen7-l3-reg-bool in 4 minutes and 39 seconds (queued for 2 seconds)
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