cnss2: Use empty tables for default regulators and clocks

Current default regulator and clock tables are for MSM platform
only. Use empty tables for non-MSM platforms by default so that
proper regulators and clocks can be added later based on platforms.

Change-Id: I2705d8ca2a0fde636f346f01e677a762b4cf92b7
Signed-off-by: Yue Ma <yuem@codeaurora.org>