defconfig: sdm429-bg: Enable only pmic4 based BCL driver

Enable pmic4 based bcl peripheral driver for sdm429-bg.
Disable pmic5 based bcl and battery soc driver for this target.

Change-Id: Ifd004021a5a20a777570ae0c0a897b4d51d28a10
Signed-off-by: Manaf Meethalavalappu Pallikunhi <manafm@codeaurora.org>