docs: Rename astlpc binding to include vendor

It helps to identify who is driving development of the binding.

Signed-off-by: Andrew Jeffery <andrew@aj.id.au>
Change-Id: Ifb4508701e2a511632ba50dcee027dc01a247fa4
diff --git a/docs/bindings/vendor-astlpc.md b/docs/bindings/vendor-ibm-astlpc.md
similarity index 100%
rename from docs/bindings/vendor-astlpc.md
rename to docs/bindings/vendor-ibm-astlpc.md