thermal: mnh-clk: Replace FSP0 with FSP1 in SW freq change

FSP0 is a boot frequency and is not supported to be switched at
runtime.  Overwirte all FSP0 requests to be FSP1.

Bug: 133340008
Change-Id: I0e66d241ff5ca99fe9a0afcc2e1000512fb2517b
Signed-off-by: Cheng Gu <gucheng@google.com>