amd: add .editorconfig

amd/common/ and amd/vulkan/ are using tabs for indent, which doesn't
match the settings in root .editorconfig, so let's override.

Signed-off-by: Grazvydas Ignotas <notasas@gmail.com>
Acked-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
diff --git a/src/amd/common/.editorconfig b/src/amd/common/.editorconfig
new file mode 100644
index 0000000..21a3c7d
--- /dev/null
+++ b/src/amd/common/.editorconfig
@@ -0,0 +1,3 @@
+[*.{c,h}]
+indent_style = tab
+indent_size = tab
diff --git a/src/amd/vulkan/.editorconfig b/src/amd/vulkan/.editorconfig
new file mode 100644
index 0000000..21a3c7d
--- /dev/null
+++ b/src/amd/vulkan/.editorconfig
@@ -0,0 +1,3 @@
+[*.{c,h}]
+indent_style = tab
+indent_size = tab