arm64: dts: qcom: pm660: Fix missing pound sign in interrupt-cells

Also add a space after '=' while at it.

Tested-by: Konrad Dybcio <konradybcio@gmail.com>
Signed-off-by: Łukasz Patron <priv.luk@gmail.com>
Link: https://lore.kernel.org/r/20200725082417.8507-1-priv.luk@gmail.com


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>