drm/sti: Remove redundant ternary operators

For ternary operators in the form of "a ? true : false", if 'a' itself
returns a boolean result, the ternary operator can be omitted. Remove
redundant ternary operators to clean up the code.

Signed-off-by: Liao Yuanhong <liaoyuanhong@vivo.com>
Acked-by: Raphaël Gallais-Pou <rgallaispou@gmail.com>
Link: https://lore.kernel.org/r/20250904112738.350652-1-liaoyuanhong@vivo.com


Signed-off-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>