Kconfig: sandbox: enable cmd_avb and dependencies

Enables cmd_avb and its dependencies need to run the AVB tests.

Reviewed-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org>
[trini: Disable for sandbox_noblk]
Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/drivers/fastboot/Kconfig b/drivers/fastboot/Kconfig
index bc25ea1..d63ecdd 100644
--- a/drivers/fastboot/Kconfig
+++ b/drivers/fastboot/Kconfig
@@ -35,6 +35,7 @@
 				ROCKCHIP_RK3399
 	default 0x280000 if ROCKCHIP_RK3368
 	default 0x100000 if ARCH_ZYNQMP
+	default 0 if SANDBOX
 	help
 	  The fastboot protocol requires a large memory buffer for
 	  downloads. Define this to the starting RAM address to use for
@@ -45,6 +46,7 @@
 	default 0x8000000 if ARCH_ROCKCHIP
 	default 0x6000000 if ARCH_ZYNQMP
 	default 0x2000000 if ARCH_SUNXI
+	default 0x8192 if SANDBOX
 	default 0x7000000
 	help
 	  The fastboot protocol requires a large memory buffer for