OvmfPkg/Bhyve/PlatformPei: Fix VS2019 X64 NOOPT build issue

REF: https://bugzilla.tianocore.org/show_bug.cgi?id=3724

Add typecast to fix build error with VS2019 X64 NOOPT converting
a UINT64 value to UINT32 value.

Cc: Rebecca Cran <rebecca@bsdio.com>
Cc: Peter Grehan <grehan@freebsd.org>
Signed-off-by: Michael D Kinney <michael.d.kinney@intel.com>
Reviewed-by: Rebecca Cran <rebecca@bsdio.com>
Acked-by: Peter Grehan <grehan@freebsd.org>
1 file changed