kernel: msm-5.4: Add Kconfig option for qps615 driver

Allow the qps615 driver to be compiled as a dynamically
loadable kernel module.

Depends-On: I371d5186c3b7928992e284c62f855a6adfe48c7e
Change-Id: Ic180f7980d729cdaf415b2c81340147f21e4ba38
Signed-off-by: Manuel Gomez <gomez@codeaurora.org>