sdcard: Don't always set the high capacity bit

Don't set the high capacity bit by default as it will be set if required
in the sd_set_csd() function.

[based on a patch from Alistair Francis <alistair.francis@xilinx.com>
 and Peter Ogden <ogden@xilinx.com> from qemu/xilinx tag xilinx-v2015.4]
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NAlistair Francis <alistair.francis@xilinx.com>
Message-id: 20180215221325.7611-2-f4bug@amsat.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/sd/sd.c

@@ -290,6 +290,10 @@ static void sd_ocr_powerup(void *opaque)
 
     /* card power-up OK */
     sd->ocr = FIELD_DP32(sd->ocr, OCR, CARD_POWER_UP, 1);
+
+    if (sd->size > 1 * G_BYTE) {
+        sd->ocr = FIELD_DP32(sd->ocr, OCR, CARD_CAPACITY, 1);
+    }
 }
 
 static void sd_set_scr(SDState *sd)
@@ -394,7 +398,6 @@ static void sd_set_csd(SDState *sd, uint64_t size)
         sd->csd[13] = 0x40;
         sd->csd[14] = 0x00;
         sd->csd[15] = 0x00;
-        sd->ocr |= 1 << 30;     /* High Capacity SD Memory Card */
     }
 }