MLECO-1860: Support for Arm GNU Embedded Toolchain

This patch enables compilation of ML use cases bare-metal applications
using Arm GNU Embedded Toolchain. The GNU toolchain can be used instead
of the Arm Compiler that was already supported.

The GNU toolchain is also set as the default toolchain when building
applications for the MPS3 target.

Note: The version of GNU toolchain must be 10.2.1 or higher.

Change-Id: I5fff242f0f52d2db6c75d292f9fa990df1aec978
Signed-off-by: Kshitij Sisodia <kshitij.sisodia@arm.com>
diff --git a/scripts/mps3/sse-300/images.txt b/scripts/mps3/sse-300/images.txt
new file mode 100644
index 0000000..b00c8b7
--- /dev/null
+++ b/scripts/mps3/sse-300/images.txt
@@ -0,0 +1,23 @@
+TITLE: Arm MPS3 FPGA prototyping board Images Configuration File
+
+; MCC mapping for Corstone-300 MPS3 bitfile package AN547
+; +-------------+---------------+-------------------------------+
+; | FPGA addr   | MCC addr      |  Region                       |
+; +-------------+---------------+-------------------------------+
+; | 0x00000000  | 0x00000000    | ITCM (NS)                     |
+; | 0x01000000  | 0x02000000    | BRAM or FPGA's data SRAM (NS) |
+; | 0x60000000  | 0x08000000    | DDR (NS)                      |
+; | 0x70000000  | 0x0c000000    | DDR (S)                       |
+; +-------------+---------------+-------------------------------+
+
+[IMAGES]
+
+TOTALIMAGES: 2 ;Number of Images (Max: 32)
+
+IMAGE0ADDRESS: 0x00000000 ; MCC@0x00000000 <=> FPGA@0x00000000
+IMAGE0UPDATE: AUTO
+IMAGE0FILE: \SOFTWARE\itcm.bin
+
+IMAGE1ADDRESS: 0x0c000000 ; MCC@0x0c000000 <=> FPGA@0x70000000
+IMAGE1UPDATE: AUTO
+IMAGE1FILE: \SOFTWARE\ddr.bin