cavs: add configuration presets for Chrome based products

As the number of configuration options is increased there is a need
to clearly specify presets that reflect features options. Specifically
the change adds option to enable Low Power Sequencer (LPS) and
Low Power Ring oscillator together.

The approach is based on keeping generic configuration in configs directory
while the override directory contains only incremental delta information.
The compilation flow assumes using make overrideconfig command. In example:

make cannonlake_defconfig
cp ../src/arch/xtensa/configs/override/cannonlake_chrome.config
override.config
make overrideconfig
make bin

Signed-off-by: Lech Betlej <lech.betlej@linux.intel.com>

src/arch/xtensa/configs/override/cannonlake_chrome.config

@@ -0,0 +1,2 @@
+CONFIG_CAVS_LPS=y
+CONFIG_CAVS_LPRO=y

src/arch/xtensa/configs/override/jasperlake_chrome.config

@@ -0,0 +1,2 @@
+CONFIG_CAVS_LPS=y
+CONFIG_CAVS_LPRO=y

src/arch/xtensa/configs/override/tigerlake_chrome.config

@@ -0,0 +1 @@
+CONFIG_CAVS_LPS=y