Platform: LPCxpresso55s69: Synchronized platform specific code with NXP MCUx SDK port

Synchronized platform/ext/target/nxp folder with MCUx latest SDK port:
-	Updated GCC startup files for LPCxpresso55s69
-	Updated flash_layout and region_defs in the partions folder for LPCxpresso55s69
-	Updated target_cfg files for LPCxpresso55s69
-	Added drivers and utilities into NativeDriver folder for LPCxpresso55s69
-	Moved common files from lpcxpresso55s69 folder to common folder
-	Updated parameters for PS in config.cmake
Added pull_drivers.cmake module for automatically updating general SDK drivers from github with specific TAG.

Signed-off-by: MartinaHanusovaNXP <martina.hanusova@nxp.com>
Change-Id: I171d7be665c931bf3be765cc8ee36fb2026d3f70