radv: Fix RB+ blending for VK_FORMAT_E5B9G9R9_UFLOAT_PACK32.

Fixes: e893102bcf5 ("radv: Add VK_FORMAT_E5B9G9R9_UFLOAT_PACK32 rendering support.")
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/7716>
(cherry picked from commit 025cb90042ba62db8f4be6b612c8f5d2b6b3746b)
2 files changed