geni-qcom-se: Reduce the ab of QUP Core2x clock

Reduce the QUP Core2x vote ab value for SPI and UART drivers
to limit the core2x clock from going to nominal level.

Change-Id: I760425e44019dd077807444baa72963eb6ee6910
Signed-off-by: Prudhvi Yarlagadda <pyarlaga@codeaurora.org>