ARM: configs: at91: enable MMC_SDHCI_OF_AT91 and MICROCHIP_PIT64B

Enable MMC_SDHCI_OF_AT91 and MICROCHIP_PIT64B. These are necessary
for SAM9X60.
Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
Link: https://lore.kernel.org/r/1579085987-13976-5-git-send-email-claudiu.beznea@microchip.comSigned-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>

arch/arm/configs/at91_dt_defconfig

@@ -160,6 +160,9 @@ CONFIG_USB_AT91=y
 CONFIG_USB_ATMEL_USBA=y
 CONFIG_USB_G_SERIAL=y
 CONFIG_MMC=y
+CONFIG_MMC_SDHCI=y
+CONFIG_MMC_SDHCI_PLTFM=y
+CONFIG_MMC_SDHCI_OF_AT91=y
 CONFIG_MMC_ATMELMCI=y
 CONFIG_MMC_SPI=y
 CONFIG_NEW_LEDS=y
@@ -177,6 +180,7 @@ CONFIG_RTC_DRV_AT91SAM9=y
 CONFIG_DMADEVICES=y
 CONFIG_AT_HDMAC=y
 CONFIG_AT_XDMAC=y
+CONFIG_MICROCHIP_PIT64B=y
 # CONFIG_IOMMU_SUPPORT is not set
 CONFIG_IIO=y
 CONFIG_AT91_ADC=y