cgroup/rdma: Drop bogus PAGE_COUNTER select

cgroup/rdma: Drop bogus PAGE_COUNTER select

When adding the Device memory controller (DMEM), "select PAGE_COUNTER"
was added to CGROUP_RDMA, presumably instead of CGROUP_DMEM.
While commit e33b51499a0a6bca ("cgroup/dmem: Select PAGE_COUNTER") added
the missing select to CGROUP_DMEM, the bogus select is still there.
Remove it.

Fixes: b168ed458ddecc17 ("kernel/cgroup: Add "dmem" memory accounting cgroup")
Closes: https://lore.kernel.org/CAMuHMdUmPfahsnZwx2iB5yfh8rjjW25LNcnYujNBgcKotUXBNg@mail.gmail.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://patchwork.freedesktop.org/patch/msgid/b4d462f038a2f895f30ae759928397c8183f6f7e.1737020925.git.geert+renesas@glider.be
Signed-off-by: Maxime Ripard <mripard@kernel.org>