logo: rename files from underscore to dash

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: Icee2c4c048993712a19bd99544cd1bfd65976d2f
diff --git a/logo/OpenBMC_Logo.svg b/logo/OpenBMC-Logo.svg
similarity index 100%
rename from logo/OpenBMC_Logo.svg
rename to logo/OpenBMC-Logo.svg