wam: disable VSync

wam: disable VSync

Enabling VSync callback support in Chromium, that sets EGL swap
interval to one, seems to be problematic as we get hangs in several
scenarios calling eglSwapBuffers and waiting forever for swap
feedback.

This happens, at least, on initial boot on Rasberry PI 4 and on H3. It
also happens after launching HVAC from launcher.

Bug-AGL: SPEC-4289, SPEC-4290
Signed-off-by: Jose Dapena Paz <jdapena@igalia.com>
Signed-off-by: Marius Vlad <marius.vlad@collabora.com>
Change-Id: I5fcaba9b8f5a1a7a362efd48d8df339168691c5e