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>

drivers/firmware/Kconfig

@@ -132,6 +132,10 @@ config ISCSI_IBFT
 	  detect iSCSI boot parameters dynamically during system boot, say Y.
 	  Otherwise, say N.
 
+config QCOM_SCM
+	bool
+	depends on ARM || ARM64
+
 source "drivers/firmware/google/Kconfig"
 source "drivers/firmware/efi/Kconfig"