etnaviv: stop oversizing buffer resources

etnaviv: stop oversizing buffer resources

PIPE_BUFFER is a target enum, not a binding. This caused the driver to
up-align the height of buffer resources, leading to largely oversizing
those resources. This is especially bad, as the buffer resources used
by the upload manager are already 1MB in size. Height alignment meant
that those would result in 4 to 8MB big BOs.

Fixes: c9e8b49b885 ("etnaviv: gallium driver for Vivante GPUs")
Cc: mesa-stable@lists.freedesktop.org
Signed-off-by: Lucas Stach <l.stach@pengutronix.de>
Reviewed-By: Wladimir J. van der Laan <laanwj@gmail.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>