airoha: an7581: Enable OF partitions support

With OF_PARTITION, partitions are configured using DT.
No need to create and pass eMMC layout to the kernel via cmdline.

airoha/an7581/config-5.4

@@ -108,7 +108,6 @@ CONFIG_CGROUP_SCHED=y
 CONFIG_CGROUP_WRITEBACK=y
 CONFIG_CLKDEV_LOOKUP=y
 CONFIG_CLONE_BACKWARDS=y
-CONFIG_CMDLINE_PARTITION=y
 CONFIG_COMMON_CLK=y
 CONFIG_CONFIGFS_FS=m
 CONFIG_COREDUMP=y
@@ -620,6 +619,7 @@ CONFIG_OF_IRQ=y
 CONFIG_OF_KOBJ=y
 CONFIG_OF_MDIO=y
 CONFIG_OF_NET=y
+CONFIG_OF_PARTITION=y
 # CONFIG_OVERLAY_FS_XINO_AUTO is not set
 CONFIG_PAGE_COUNTER=y
 # CONFIG_PANIC_ON_OOPS is not set