bcm53xx: fix target name of meraki_mx64-a0

The target name of meraki_mx64-a0 in
target/linux/bcm53xx/image/Makefile used not to be consistent with the
one defined in target/linux/bcm53xx/base-files/lib/upgrade/platform.sh
and generates warning for "Image check failed" during sysupgrade.

This commit would also make the target name for meraki_mx64-a0 to
conform to the openwrt standard.

Signed-off-by: Edward Chow <[email protected]>
Link: https://github.com/openwrt/openwrt/pull/22034
Signed-off-by: Hauke Mehrtens <[email protected]>

target/linux/bcm53xx/image/Makefile

@@ -459,13 +459,13 @@ define Device/meraki_mx64
 endef
 TARGET_DEVICES += meraki_mx64
 
-define Device/meraki_mx64_a0
+define Device/meraki_mx64-a0
   $(call Device/meraki_mx64)
   DEVICE_VARIANT := A0
   DEVICE_DTS_CONFIG := config@2
   DEVICE_DTS := bcm958625-meraki-mx64-a0
 endef
-TARGET_DEVICES += meraki_mx64_a0
+TARGET_DEVICES += meraki_mx64-a0
 
 define Device/meraki_mx65
   $(call Device/meraki_mx6x)