logo: add logo with words over icon

Many websites use a circular-style profile icon, which causes the
original OpenBMC logo to often have edges of letters chopped off.
Use the original SVG logo to c

logo: add logo with words over icon

Many websites use a circular-style profile icon, which causes the
original OpenBMC logo to often have edges of letters chopped off.
Use the original SVG logo to create a squarer logo where the OpenBMC
phrase is on top of the icon. This is useful for create profile icons.

Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
Change-Id: I5181bc02e47c5dbb40631a3707812c4dd4073b32

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