staging: most: rename DIM_NormCtrlAsyncBufferSize to dim_norm_ctrl_async_buffer_size

This patch renames DIM_NormCtrlAsyncBufferSize to
dim_norm_ctrl_async_buffer_size to avoid camelcase found by checkpatch

CHECK: Avoid CamelCase: <DIM_NormCtrlAsyncBufferSize>
FILE: drivers/staging/most/hdm-dim2/dim2_hal.c:709:

Signed-off-by: Chaehyun Lim <chaehyun.lim@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>