cnss2: Add support of runtime Vreg enable for QCA6490

QCA6490 with internal regulator configuration needs additional
voltage regulator to be enabled. Update platform driver to get
the config from BDF using QMI and enable it in TCS accordingly.

Change-Id: Idb93fb95d46696f943f166e31cf50dc5b3b0da97
Signed-off-by: Manikandan Mohan <manikand@codeaurora.org>