dt-bindings: i2c: dw: merge duplicate compatible entry.

dt-bindings: i2c: dw: merge duplicate compatible entry.

Each vendor have an items entry of its own compatible, It is needless
and some can be merged as it share the same base "snps,designware-i2c"
compatible.

Merge the duplicate compatible entry into one item entry.

Signed-off-by: Inochi Amaoto <inochiama@gmail.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20250413223507.46480-2-inochiama@gmail.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>