hocclk: add migration guide

Source/hoc-clk/MIGRATION.md

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+Ensure you include the latest hoc-clk ipc and header files in your project before proceeding
+
+Before running migration replacements, change every reference to sys-clk's ramload api to this
+ramLoad -> partLoad
+SysClkRamLoad_All -> HocClkPartLoad_EMC
+SysClkRamLoad_Cpu -> HocClkPartLoad_EMCCpu
+
+API version reference must be changed. use != to compare to HOCCLK_IPC_API_VERSION
+If you use the service name, use HOCCLK_IPC_SERVICE_NAME
+
+Remove checks for the u8 enabled in sysclk clockmanager struct. Check if hocclk is enabled by listening to IPC results
+
+Run the following replace commands (case sensitive):
+
+sysclk -> hocclk
+SysClk -> HocClk
+SYSCLK -> HOCCLK
+sysClk -> hocClk
+
+Your project is now migrated to run with HOC