ANDROID: GKI: power: supply: Remove "Wipower" PSY type

Remove "Wipower" PSY type as it is not used by any driver.

Change-Id: Ib198b38a22c275ff1c390f1e5eac12a4e914b66b
Signed-off-by: Guru Das Srinagesh <gurus@codeaurora.org>
(cherry picked from commit 5573bd8e)
Signed-off-by: Mark Salyzyn <salyzyn@google.com>
Bug: 150789066