drm/i915: Extract VESA DSC bpp alignment to separate function

We might to use that function separately from intel_dp_dsc_compute_config
for DP DSC over MST case, because allocating bandwidth in that
case can be a bit more tricky. So in order to avoid code copy-pasta
lets extract this to separate function and reuse it for both SST
and MST cases.

v2: Removed multiple blank lines
v3: Rename intel_dp_dsc_nearest_vesa_bpp to intel_dp_dsc_nearest_valid_bpp
    to reflect its meaning more properly.
    (Manasi Navare)

Signed-off-by: Stanislav Lisovskiy <[email protected]>
Reviewed-by: Manasi Navare <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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