staging: most: rename DIM_EnqueueBuffer to dim_enqueue_buffer

This patch renames DIM_EnqueueBuffer to dim_enqueue_buffer to avoid
camelcase found by checkpatch.

CHECK: Avoid CamelCase: <DIM_EnqueueBuffer>
FILE: drivers/staging/most/hdm-dim2/dim2_hal.c:877:

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