History for mbed-os / targets / TARGET_ARM_SSG / TARGET_MPS2 / TARGET_MPS2_M3 / device / TOOLCHAIN_IAR / startup_MPS2.S

Add file MPS2.icf and startup_MPS2.S to suppout IAR of the target
AN385(ARM_MPS2_M3). Add "IAR" to supported_toolchain list.

Change-Id: I038b05b8b21bd146a1568de897ed030ccd52ab79
Signed-off-by: Shawn Shan <shawn.shan@arm.com>