configs: sama7g5: use PIT64B

Use PIT64B driver. ATMEL_PIT is not available for SAMA7G5.

Signed-off-by: Claudiu Beznea <claudiu.beznea@microchip.com>
diff --git a/configs/sama7g5ek_mmc1_defconfig b/configs/sama7g5ek_mmc1_defconfig
index 936d9cd..7d4d409 100644
--- a/configs/sama7g5ek_mmc1_defconfig
+++ b/configs/sama7g5ek_mmc1_defconfig
@@ -58,5 +58,6 @@
 CONFIG_DEBUG_UART_ANNOUNCE=y
 CONFIG_ATMEL_USART=y
 CONFIG_TIMER=y
+CONFIG_MCHP_PIT64B_TIMER=y
 CONFIG_OF_LIBFDT_OVERLAY=y
 # CONFIG_EFI_LOADER_HII is not set