arm64: dts: qcom: add missing denali-oled.dtb to Makefile

arm64: dts: qcom: add missing denali-oled.dtb to Makefile

The DeviceTree for the OLED variant of the Microsoft Surface Pro 11th
Edition was originally added in commit '0d72ccaa1e84 ("arm64: dts: qcom:
Add support for X1-based Surface Pro 11")'. The original patch on the
mailing list also added the new device tree to the Makefile but that
part seems to have been dropped (by accident) when it got merged.

Signed-off-by: Tobias Heider <tobias.heider@canonical.com>
Fixes: 0d72ccaa1e84 ("arm64: dts: qcom: Add support for X1-based Surface Pro 11")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260226140429.232544-3-tobias.heider@canonical.com
[bjorn: Rewrote commit message reference to offending commit]
Signed-off-by: Bjorn Andersson <andersson@kernel.org>