meson: Format build files with `meson format`

Additionally, add the formatting command to `scripts/pre-submit` so it's
run by OpenBMC's CI (via `scripts/run-ci`).

Change-Id: Ifb8fc06106b8cfa9155e986528b769a5ca450b4c
Signed-off-by: Andrew Jeffery <andrew@codeconstruct.com.au>
diff --git a/src/oem/meta/meson.build b/src/oem/meta/meson.build
index 6c89286..c618ac7 100644
--- a/src/oem/meta/meson.build
+++ b/src/oem/meta/meson.build
@@ -1,3 +1 @@
-libpldm_sources += files(
-    'file_io.c'
-  )
+libpldm_sources += files('file_io.c')