ARM: dts: qcom: apq8064 - add RPM regulators support

This patch adds rpm node to apq8064 dt as rpm would be used by other
devices for regulator support.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Reviewed-by: Bjorn Andersson <bjorn.andersson@sonymobile.com>
Signed-off-by: Kumar Gala <galak@codeaurora.org>