Aside from the core mbed-os CMake target, a number of targets have been created so they can optionally be included by application executables that require them using `target_link_libraries()`.
Co-authored-by: Martin Kojtal <martin.kojtal@arm.com>
Co-authored-by: Rajkumar Kanagaraj <rajkumar.kanagaraj@arm.com>
Passed GreenTea CI.
Added RZ_A2XX and GR_MANGO to targets.json.
Added RZ_A2XX to mbedlib.json in lwipstack and netsocket/ppp.
Added TARGET_RZ_A2XX directory to targets/TARGET_RENESAS.
Added TARGET_RENESAS_EMAC directory to features/netsocket/emac-drivers.
Moved TARGET_RZ_A1_EMAC directory into the TARGET_RENESAS_EMAC directory below and renamed to TARGET_RZ_A1XX.
Added TARGET_RZ_A2XX directory to features/netsocket/emac-drivers/TARGET_RENESAS_EMAC.