x86/platform/uv: Remove support for UV1 platform from uv

UV1 is not longer supported by HPE

Signed-off-by: Steve Wahl <steve.wahl@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20200713212955.320087418@hpe.com