Camera: Remove ZOOM_METHOD from capture request for HAL

ZOOM_METHOD is a framework only key. Remove it from the capture request
before sending it to the camera HAL.

Flag: EXEMPT bugfix
Test: Use camera
Bug: 379333302
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:dc2300cc7533d77c59ef5ac8711b97e660bc338e)
Merged-In: I2df90b2282f8845a6bde213f958bf303d770efbd
Change-Id: I2df90b2282f8845a6bde213f958bf303d770efbd