arm64: dts: qcom: sm6125-xiaomi-ginkgo: Fix volume up button

arm64: dts: qcom: sm6125-xiaomi-ginkgo: Fix volume up button

gpio6 in pm6125 is used for EMMC and UFS thermal monitoring. It is
changed to the correct gpio for volume up button.

Fixes: 9b1a6c925c88 ("arm64: dts: qcom: sm6125: Initial support for xiaomi-ginkgo")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Biswapriyo Nath <nathbappai@gmail.com>
Link: https://lore.kernel.org/r/20260121-xiaomi-ginkgo-features-v2-1-fb3ee94922d0@gmail.com
Signed-off-by: Bjorn Andersson <andersson@kernel.org>