emulation: qemu-sbsa: Select SYS_PCI_64BIT

qemu's sbsa-ref is always using a 64bit CPU and the PCI prefetch MMIO
window is located above 4GiB, thus always enable SYS_PCI_64BIT.

Signed-off-by: Patrick Rudolph <patrick.rudolph@9elements.com>
diff --git a/board/emulation/qemu-sbsa/Kconfig b/board/emulation/qemu-sbsa/Kconfig
index 72c76b3..f4ad63e 100644
--- a/board/emulation/qemu-sbsa/Kconfig
+++ b/board/emulation/qemu-sbsa/Kconfig
@@ -33,6 +33,7 @@
 	select OF_SEPARATE
 	select PCI
 	select PCIE_ECAM_GENERIC
+	select SYS_PCI_64BIT
 	select USB
 	select GIC_V3
 	select GIC_V3_ITS