[PATCH] tests: Align THP tests to the 32MB huge-page size

Hi Xi,

I agree we should avoid creating even more target specific defines and errors.

grep THP_PAGE_SIZE -R *
sysdeps/unix/sysv/linux/Makefile:THP-PAGE-SIZE-CFLAGS = -DTHP_PAGE_SIZE=$(THP-PAGE-SIZE)
sysdeps/unix/sysv/linux/tst-thp-size.S:   .space 2 * THP_PAGE_SIZE

It's not really a THP page size as its only use is to force a large .text section.
So I'm not sure we even need a define for this, let alone making it target
specific - it could just be a fixed amount. Assuming we keep the 32MB limit
on THP pages, 64MB should be fine for all targets.

Cheers,
Wilco