hw: Rename boolean config value field from bool to boolean

"bool" conflicts with C++ (meh) and stdbool.h (ngh alright fine). This
is a driver-visible change and will likely break the build for mach64,
but it can be fixed by simply using xf86ReturnOptValBool like every
other driver.

Signed-off-by: Adam Jackson <ajax@redhat.com>
3 jobs for _bool in 5 minutes and 58 seconds (queued for 1 second)