Log the warning if logo description exceeds char limit.

1. Remove the exception for logo description char limit and log a
   warning instead.
2. Truncate if the logo description exceeds 30 characters
3. Set title's top constraint on both logo icon and logo description for
   non-icon or non-description cases.

Flag: android.hardware.biometrics.custom_biometric_prompt
Bug: 355677518
Test: manual test on test app
Test: atest BiometricPromptTest
Test: atest BiometricPromptScreenshotTest
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:86e209599423f7a69f1466eadd71e94041164b4a)
Merged-In: Icb07acd88138a7519f73d3df9ab323220d99dfe7
Change-Id: Icb07acd88138a7519f73d3df9ab323220d99dfe7