sc7180: Provide initial SoC support

Change-Id: Iddcef560c1987486436b73ca1d5fc83cee2f713c
Signed-off-by: T Michael Turney <mturney@codeaurora.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35494
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

Documentation/soc/qualcomm/index.md

@@ -0,0 +1,7 @@
+# Qualcomm SOC-specific documentation
+
+This section contains documentation about coreboot on specific Qualcomm SOCs.
+
+## Platforms
+
+- [SC7180 series](sc7180/index.md)