x86/platform/uv: Remove uv bios and efi code related to EFI_UV1_MEMMAP

With UV1 removed, EFI_UV1_MEMMAP is not longer used.  Remove the code used
by it and the related code in EFI.

Signed-off-by: Steve Wahl <steve.wahl@hpe.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Ard Biesheuvel <ardb@kernel.org>
Link: https://lkml.kernel.org/r/20200713212955.902592618@hpe.com