hw/sd/sdhci: Add a comment to distinct the i.MX eSDHC functions

This file keeps the various QDev blocks separated by comments.
Signed-off-by: NPhilippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: NCleber Rosa <crosa@redhat.com>
Message-id: 20191005154748.21718-3-f4bug@amsat.org
Signed-off-by: NPeter Maydell <peter.maydell@linaro.org>

hw/sd/sdhci.c

@@ -1532,6 +1532,8 @@ static const TypeInfo sdhci_bus_info = {
     .class_init = sdhci_bus_class_init,
 };
 
+/* --- qdev i.MX eSDHC --- */
+
 static uint64_t usdhc_read(void *opaque, hwaddr offset, unsigned size)
 {
     SDHCIState *s = SYSBUS_SDHCI(opaque);
@@ -1734,7 +1736,6 @@ usdhc_write(void *opaque, hwaddr offset, uint64_t val, unsigned size)
     }
 }
 
-
 static const MemoryRegionOps usdhc_mmio_ops = {
     .read = usdhc_read,
     .write = usdhc_write,