qcom: scm: Move scm-boot files to drivers/soc/qcom/ and include/soc/qcom

Follow the scm.c and move scm-boot files to drivers/soc/qcom. The
guidance is to clean files out from mach-qcom and move to drivers/soc
area.

Signed-off-by: Lina Iyer <lina.iyer@linaro.org>
Reviewed-by: Stephen Boyd <sboyd@codeaurora.org>