net: cnss: enable rome_vreg_dsrc regulator for dsrc

rome_vreg_dsrc regulator is a fixed regulator and this regulator
is control by PMIC gpio4. This is being used as vdd supply for
the wlan DSRC module based on sdio interface. Enable rome_vreg_dsrc
voltage regulators to enable the power up support in CNSS SDIO
platform driver.

Change-Id: I7c6032b706d468cc57b5304a3627f526935fb3a3
Signed-off-by: Govind Singh <govinds@codeaurora.org>