firmware: raspberrypi: Fix type assignment

firmware: raspberrypi: Fix type assignment

We silently cast an unsigned int into a __le32 which makes sparse
complain. Moreover, we never actually convert endianness between the
CPU's and the expected little-endian value. Fix both at once by calling
cpu_to_le32().

Fixes: 40c31955e4e9 ("firmware: raspberrypi: Provide a helper to query a clock max rate")
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/20221116091712.1309651-3-maxime@cerno.tech
Signed-off-by: Maxime Ripard <maxime@cerno.tech>
Link: https://lore.kernel.org/r/20230102115255.17802-1-maxime@cerno.tech
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>