media: rppx1: describe the MAIN_POST white balance gains block

rppx1_ext_params_blocks_info[] is indexed by block type and is built
with designated initialisers, so a block type without an entry is left
as a zero-sized hole. RPPX1_PARAMS_BLOCK_TYPE_AWBG_POST is the only
such hole: a block reporting that type and a size of zero passes
v4l2_isp_params_validate_buffer(), which then has nothing to advance
the walk with.

Describe the block, so the array covers all block types the uAPI
defines. The MAIN_POST white balance gains module is probed and started
with the rest of the POST pipe, and RPPX1_PARAMS_MAX_SIZE already
reserves room for all three white balance gains blocks.

The block is not dispatched by rppx1_params(), in line with the other
described blocks that have no users yet.

Reviewed-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Reviewed-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Linmao Li <lilinmao@kylinos.cn>
Signed-off-by: Jacopo Mondi <jacopo.mondi@ideasonboard.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>

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