hw/sdhci: introduce standard SD host controller

Device model for standard SD Host Controller Interface (SDHCI) compliant with
version 2.00 of SD association specification.

Signed-off-by: Peter Crosthwaite <peter.crosthwaite@xilinx.com>
Signed-off-by: Igor Mitsyanko <i.mitsyanko@samsung.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>

Author: Igor Mitsyanko

default-configs/arm-softmmu.mak

@@ -47,3 +47,5 @@ CONFIG_XGMAC=y
 
 CONFIG_VERSATILE_PCI=y
 CONFIG_VERSATILE_I2C=y
+
+CONFIG_SDHCI=y

hw/Makefile.objs

@@ -43,6 +43,7 @@ common-obj-y += ccid-card-passthru.o
 common-obj-$(CONFIG_SMARTCARD_NSS) += ccid-card-emulated.o
 endif
 common-obj-$(CONFIG_I8259) += i8259_common.o i8259.o
+common-obj-$(CONFIG_SDHCI) += sdhci.o
 common-obj-y += fifo.o
 common-obj-y += pam.o