sandbox: Add PCI driver and test for p2sb

Add a sandbox driver and PCI-device emulator for p2sb. Also add a test
which uses a simple 'adder' driver to test the p2sb functionality.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 78b598b..44c9e3e 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -10,8 +10,10 @@
 obj-$(CONFIG_$(SPL_TPL_)CROS_EC_LPC) += cros_ec_lpc.o
 
 ifndef CONFIG_SPL_BUILD
+obj-$(CONFIG_SANDBOX) += sandbox_adder.o
 obj-$(CONFIG_CROS_EC_I2C) += cros_ec_i2c.o
 obj-$(CONFIG_CROS_EC_SPI) += cros_ec_spi.o
+obj-$(CONFIG_SANDBOX) += p2sb_sandbox.o p2sb_emul.o
 obj-$(CONFIG_SANDBOX) += swap_case.o
 endif