dt-bindings: power: rpmpd: Update part number to X1E80100

dt-bindings: power: rpmpd: Update part number to X1E80100

There was a recent part number update from SC8380XP to X1E80100 and as
a result of which the SC8380xp rpmpd bindings introduced is no longer
correct. Given that it currently has no users, it was agreed that it
can be updated to the correct part number (X1E80100) without causing
any binding breakage.

Signed-off-by: Sibi Sankar <quic_sibis@quicinc.com>
Reviewed-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Link: https://lore.kernel.org/r/20231123100021.10918-2-quic_sibis@quicinc.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>