zephyr: enable progressive erase on all nRF boards

Enables BOOT_ERASE_PROGRESSIVELY for Nordic nRF boards.

This fixes issue where mcumgr upload command would result in
device being deleted, but no new image being uploaded
due to timeout while waiting for erase operation.

This avoids a delay of several seconds during firmware upload.

Signed-off-by: Bernt Johan Damslora <bernt.johan.damslora@nordicsemi.no>
Signed-off-by: Emil Obalski <emil.obalski@nordicsemi.no>
Signed-off-by: Andrzej Puzdrowski <andrzej.puzdrowski@nordicsemi.no>
Signed-off-by: Håkon Øye Amundsen <haakon.amundsen@nordicsemi.no>
Signed-off-by: Martí Bolívar <marti.bolivar@nordicsemi.no>
diff --git a/boot/zephyr/Kconfig b/boot/zephyr/Kconfig
index 0e92566..410fc27 100644
--- a/boot/zephyr/Kconfig
+++ b/boot/zephyr/Kconfig
@@ -276,7 +276,7 @@
 
 config BOOT_ERASE_PROGRESSIVELY
 	bool "Erase flash progressively when receiving new firmware"
-	default y if SOC_NRF52840
+	default y if SOC_FAMILY_NRF
 	help
 	 If enabled, flash is erased as necessary when receiving new firmware,
 	 instead of erasing the whole image slot at once. This is necessary