drm/exynos: fix pages allocation size in lowlevel_buffer_allocate
drm/exynos: fix pages allocation size in lowlevel_buffer_allocate

When IOMMU is not supported, buf->pages has to be allocated to
assign the result of phys_to_page() which return type is struct
page *. So it is sufficient to allocate buf->pages with the size
of multiple struct page pointers.

Signed-off-by: YoungJun Cho <25faea15f7ca65ff494bd1bddb0a00c8c45942d9@samsung.com>
Signed-off-by: Seung-Woo Kim <f0452ad01023e1e19deb03356bab8e3b5dbc61a6@samsung.com>
Signed-off-by: Kyungmin Park <504c23c4986a3760712724894be3105092c27331@samsung.com>
Signed-off-by: Inki Dae <bae4a7a27bbc965064e97edd6e179ac4979db440@samsung.com>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs