drm/i915/dmc: Let's abstract the dmc path.

Although this abstraction removes the convenience of grepping
for the file name, it:
- makes addition easier.
- makes it easier to tweak global path when experiments are needed.
- get in sync with guc/huc, without getting overly abstracted.
- allows future junction with CSR_VERSION for simplicity.
- Enforces dmc file will never change this standard.

v2: define DMC_PATH inside .c (Lucas)

Cc: Fei Yang <[email protected]>
Cc: Jani Nikula <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]> #v1
Reviewed-by: Jani Nikula <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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