arm64: dts: qcom: sa8540p-pmics: add missing interrupt include

Add the missing interrupt-controller include which is needed by the RTC
node.

Reviewed-by: Brian Masney <bmasney@redhat.com>
Reviewed-by: Eric Chanudet <echanude@redhat.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20230111160335.7175-2-johan+linaro@kernel.org