ARM: dts: apq8064: remove temporary fixed regulator for mmc

This patch removes temporary fixed regluator use for mmc.
Board files should use the regulators which are wiredup appropriately.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Andy Gross <agross@codeaurora.org>