dt-bindings: Drop Bhupesh Sharma from maintainers

For more than a year all emails to Bhupesh Sharma's Linaro emails bounce
and there were no updates to mailmap.  No reviews from Bhupesh, either,
so change the maintainer to Bjorn and Konrad (Qualcomm SoC maintainers).

Cc: Bhupesh Sharma <bhupesh.linux@gmail.com>
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Acked-by: Konrad Dybcio <konradybcio@kernel.org>
Message-ID: <20241130094758.15553-1-krzysztof.kozlowski@linaro.org>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>