PM / devfreq: mtk-cci: avoid redundant conditions

While 'if (i <= 0) ... else if (i > 0) ...' is technically equivalent to
'if (i <= 0) ... else ...', the latter is vastly easier to read because
it avoids writing out a condition that is unnecessary. Let's drop such
unnecessary conditions.

Signed-off-by: Liao Yuanhong <liaoyuanhong@vivo.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
Link: https://patchwork.kernel.org/project/linux-pm/patch/20250903121452.387023-1-liaoyuanhong@vivo.com/