ipq40xx-generic: EN WS-AP3915i remove BLOCKSIZE from image definition

The blocksize was too high, resulting in forgetting the config on sysupgrade
It is not needed for SPI-NOR.

Signed-off-by: Florian Maurer <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/17305
Signed-off-by: Robert Marko <[email protected]>

target/linux/ipq40xx/image/generic.mk

@@ -542,7 +542,6 @@ define Device/extreme-networks_ws-ap3915i
 	DEVICE_MODEL := WS-AP3915i
 	IMAGE_SIZE := 30080k
 	SOC := qcom-ipq4029
-	BLOCKSIZE := 128k
 	IMAGE/sysupgrade.bin := append-kernel | append-rootfs | pad-rootfs | check-size | append-metadata
 endef
 TARGET_DEVICES += extreme-networks_ws-ap3915i