hw/riscv: Kconfig: add CBQRI options

Add boolean property for CBQRI and imply it should be enabled for the
RISC-V virt machine.

Signed-off-by: Nicolas Pitre <npitre@baylibre.com>
Signed-off-by: Drew Fustini <dfustini@baylibre.com>

hw/riscv/Kconfig

+config RISCV_CBQRI
+    bool
+
 config RISCV_NUMA
     bool
 
@@ -45,6 +48,7 @@ config RISCV_VIRT
     select FW_CFG_DMA
     select PLATFORM_BUS
     select ACPI
+    imply RISCV_CBQRI
 
 config SHAKTI_C
     bool