arm64: dts: qcom: msm8917-xiaomi-riva: Fix board-id for all bootloader

arm64: dts: qcom: msm8917-xiaomi-riva: Fix board-id for all bootloader

Redmi 5A comes with multiple bootloader versions where the expected
board-id is different.
Change the board-id to unified form what works on both bootloader
version.

Fixes: 26633b582056 ("arm64: dts: qcom: Add Xiaomi Redmi 5A")
Reviewed-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Signed-off-by: Barnabás Czémán <barnabas.czeman@mainlining.org>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20260315-riva-common-v3-1-897f130786ed@mainlining.org
Signed-off-by: Bjorn Andersson <andersson@kernel.org>