firmware: qcom: scm: Move the scm driver to drivers/firmware

Architectural changes in the ARM Linux kernel tree mandate the eventual
removal of the mach-* directories. Move the scm driver to
drivers/firmware and the scm header to include/linux to support that
removal.

Signed-off-by: Kumar Gala <galak@codeaurora.org>
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig
index 9f1f09a..7ffd151 100644
--- a/arch/arm/Kconfig
+++ b/arch/arm/Kconfig
@@ -2160,6 +2160,8 @@
 
 source "drivers/Kconfig"
 
+source "drivers/firmware/Kconfig"
+
 source "fs/Kconfig"
 
 source "arch/arm/Kconfig.debug"