dts: walleye audio: request PWM for VBOB for earpiece routing

configuration 1 is the voice_handset configuration, forve VBOB
rail to PWM when this configuration is enable.

Bug: 64839820
Change-Id: I08054a375dbca217fa123f33d8ccdda51dce785f
Signed-off-by: Thierry Strudel <tstrudel@google.com>