sysota: Set BootPartitionMountDir=/run/mount/boot

ASOS images mount the platform boot partition at /run/mount/boot.
Adjust the Raspberry Pi 4 specific configuration file to express that
location.

Signed-off-by: Zygmunt Krynicki <zygmunt.krynicki@huawei.com>

meta-ohos-core/recipes-ota/sysota/files/raspberrypi4/sysotad.conf

@@ -4,3 +4,4 @@
 
 [OTA]
 BootLoaderType=pi-boot
+BootPartitionMountDir=/run/mount/boot