Add wear specific layout for GrantCredentialsPermissionActivity

This change adds wear specific layout for
GrantCredentialsPermissionActivity such that device default dark
background is used instead of light background. Also adjusted margins
and paddings to fit within the watch.

Bug: 195555569

Test: manual test: screenshot.googleplex.com/XUxrkJNUEtks2sa
(cherry picked from commit adebeb30dd655d5abb22de77984b40189cb2d5b1)
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:a3618231af70b4a7b9fc5b0e1262b1c9c931acb9)
Merged-In: I505f5670c0f8b370af15e21131c25a6fd165aadb
Change-Id: I505f5670c0f8b370af15e21131c25a6fd165aadb