thermal/drivers/sprd: Use min instead of clamp in sprd_thm_temp_to_rawdata

thermal/drivers/sprd: Use min instead of clamp in sprd_thm_temp_to_rawdata

Clamping 'val' to itself is unnecessary and the expression can be
simplified by using min() instead. Casting SPRD_THM_RAW_DATA_HIGH to u32
is also redundant and can be removed.

Reviewed-by: Baolin Wang <baolin.wang@linux.alibaba.com>
Reviewed-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Link: https://patch.msgid.link/20260310102523.201722-3-thorsten.blum@linux.dev
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>